diff --git a/src/Components/App/MenuActions.ts b/src/Components/App/MenuActions.ts
index c144acc..c849ca8 100644
--- a/src/Components/App/MenuActions.ts
+++ b/src/Components/App/MenuActions.ts
@@ -2,7 +2,7 @@ import { Dispatch, SetStateAction } from 'react';
 import { IConfiguration } from '../../Interfaces/IConfiguration';
 import { ContainerModel } from '../../Interfaces/IContainerModel';
 import { fetchConfiguration } from '../API/api';
-import { IEditorState } from '../../Interfaces/IEditorState';
+import { IEditorState } from "../../Interfaces/IEditorState";
 import { LoadState } from './Load';
 
 export function NewEditor(
@@ -23,7 +23,6 @@ export function NewEditor(
           width: configuration.MainContainer.Width,
           height: configuration.MainContainer.Height,
           isRigidBody: false,
-          isAnchor: false,
           fillOpacity: 0,
           stroke: 'black'
         }
diff --git a/src/Components/Editor/Behaviors/AnchorBehaviors.ts b/src/Components/Editor/Behaviors/AnchorBehaviors.ts
deleted file mode 100644
index 8d1adf9..0000000
--- a/src/Components/Editor/Behaviors/AnchorBehaviors.ts
+++ /dev/null
@@ -1,64 +0,0 @@
-/**
- * @module AnchorBehavior
- *
- * An anchor is a container that takes physical priority in the representation :
- * - It cannot be moved by other rigid siblings container
- * - It cannot be resized by any other siblings container
- * - It cannot overlap any other siblings rigid container :
- *  - overlapping container are shifted to the nearest available space/width
- *  - or resized when there is no available space left other than theirs
- *  - or lose their rigid body properties when there is no available space left)
- * Meaning that:
- * - Moving an anchor container will resize the width of an overlapping container
- *   or make them lose their property as a rigid body
- */
-
-import { IContainerModel } from '../../../Interfaces/IContainerModel';
-import { constraintBodyInsideUnallocatedWidth } from './RigidBodyBehaviors';
-
-/**
- * Impose the container position
- * Apply the following modification to the overlapping rigid body container :
- */
-export function ImposePosition(container: IContainerModel): IContainerModel {
-  if (container.parent === undefined ||
-    container.parent === null) {
-    return container;
-  }
-
-  // Get the closest one
-  const rigidBodies = container.parent.children.filter(
-    child => child.properties.isRigidBody && !child.properties.isAnchor
-  );
-
-  const overlappingContainers = getOverlappingContainers(container, rigidBodies);
-  for (const overlappingContainer of overlappingContainers) {
-    constraintBodyInsideUnallocatedWidth(overlappingContainer);
-  }
-  return container;
-}
-
-function getOverlappingContainers(
-  container: IContainerModel,
-  siblings: IContainerModel[]
-): IContainerModel[] {
-  const min1 = container.properties.x;
-  const max1 = container.properties.x + Number(container.properties.width);
-  const overlappingContainers: IContainerModel[] = [];
-  for (const sibling of siblings) {
-    if (sibling === container) {
-      continue;
-    }
-
-    const min2 = sibling.properties.x;
-    const max2 = sibling.properties.x + Number(sibling.properties.width);
-    const isOverlapping = Math.min(max1, max2) - Math.max(min1, min2) > 0;
-
-    if (!isOverlapping) {
-      continue;
-    }
-
-    overlappingContainers.push(sibling);
-  }
-  return overlappingContainers;
-}
diff --git a/src/Components/Editor/ContainerOperations.ts b/src/Components/Editor/ContainerOperations.ts
index 63d90a0..40391c5 100644
--- a/src/Components/Editor/ContainerOperations.ts
+++ b/src/Components/Editor/ContainerOperations.ts
@@ -4,7 +4,6 @@ import { IConfiguration } from '../../Interfaces/IConfiguration';
 import { ContainerModel, IContainerModel } from '../../Interfaces/IContainerModel';
 import { findContainerById } from '../../utils/itertools';
 import { getCurrentHistory } from './Editor';
-import IProperties from '../../Interfaces/IProperties';
 
 /**
  * Select a container
@@ -204,23 +203,20 @@ export function AddContainer(
     }
   }
 
-  const defaultProperties: IProperties = {
-    id: `${type}-${count}`,
-    parentId: parentClone.properties.id,
-    x,
-    y: 0,
-    width: properties.Width,
-    height: parentClone.properties.height,
-    isRigidBody: false,
-    isAnchor: false,
-    XPositionReference: properties.XPositionReference,
-    ...properties.Style
-  };
-
   // Create the container
   const newContainer = new ContainerModel(
     parentClone,
-    defaultProperties,
+    {
+      id: `${type}-${count}`,
+      parentId: parentClone.properties.id,
+      x,
+      y: 0,
+      width: properties?.Width,
+      height: parentClone.properties.height,
+      isRigidBody: false,
+      XPositionReference: properties.XPositionReference,
+      ...properties.Style
+    },
     [],
     {
       type
diff --git a/src/Components/Editor/PropertiesOperations.ts b/src/Components/Editor/PropertiesOperations.ts
index ed5a4db..11c1b62 100644
--- a/src/Components/Editor/PropertiesOperations.ts
+++ b/src/Components/Editor/PropertiesOperations.ts
@@ -4,9 +4,7 @@ import { IHistoryState } from '../../Interfaces/IHistoryState';
 import IProperties from '../../Interfaces/IProperties';
 import { findContainerById } from '../../utils/itertools';
 import { getCurrentHistory } from './Editor';
-import { RecalculatePhysics } from './Behaviors/RigidBodyBehaviors';
-import { INPUT_TYPES } from '../Properties/PropertiesInputTypes';
-import { ImposePosition } from './Behaviors/AnchorBehaviors';
+import { RecalculatePhysics } from './RigidBodyBehaviors';
 
 /**
   * Handled the property change event in the properties form
@@ -30,6 +28,20 @@ export function OnPropertyChange(
     throw new Error('[OnPropertyChange] Property was changed before selecting a Container');
   }
 
+  if (parent === null) {
+    const selectedContainerClone: IContainerModel = structuredClone(current.SelectedContainer);
+    (selectedContainerClone.properties as any)[key] = value;
+    setHistory(history.concat([{
+      LastAction: 'Change property of main',
+      MainContainer: selectedContainerClone,
+      SelectedContainer: selectedContainerClone,
+      SelectedContainerId: selectedContainerClone.properties.id,
+      TypeCounters: Object.assign({}, current.TypeCounters)
+    }]));
+    setHistoryCurrentStep(history.length);
+    return;
+  }
+
   const mainContainerClone: IContainerModel = structuredClone(current.MainContainer);
   const container: ContainerModel | undefined = findContainerById(mainContainerClone, current.SelectedContainer.properties.id);
 
@@ -37,15 +49,7 @@ export function OnPropertyChange(
     throw new Error('[OnPropertyChange] Container model was not found among children of the main container!');
   }
 
-  if (INPUT_TYPES[key] === 'number') {
-    (container.properties as any)[key] = Number(value);
-  } else {
-    (container.properties as any)[key] = value;
-  }
-
-  if (container.properties.isAnchor) {
-    ImposePosition(container);
-  }
+  (container.properties as any)[key] = value;
 
   if (container.properties.isRigidBody) {
     RecalculatePhysics(container);
@@ -84,6 +88,25 @@ export function OnPropertiesSubmit(
     throw new Error('[OnPropertyChange] Property was changed before selecting a Container');
   }
 
+  if (parent === null) {
+    const selectedContainerClone: IContainerModel = structuredClone(current.SelectedContainer);
+    for (const property in properties) {
+      const input = (event.target as HTMLFormElement).querySelector(`#${property}`);
+      if (input instanceof HTMLInputElement) {
+        (selectedContainerClone.properties as any)[property] = input.value;
+      }
+    }
+    setHistory(history.concat([{
+      LastAction: 'Change property of main',
+      MainContainer: selectedContainerClone,
+      SelectedContainer: selectedContainerClone,
+      SelectedContainerId: selectedContainerClone.properties.id,
+      TypeCounters: Object.assign({}, current.TypeCounters)
+    }]));
+    setHistoryCurrentStep(history.length);
+    return;
+  }
+
   const mainContainerClone: IContainerModel = structuredClone(current.MainContainer);
   const container: ContainerModel | undefined = findContainerById(mainContainerClone, current.SelectedContainer.properties.id);
 
@@ -95,11 +118,6 @@ export function OnPropertiesSubmit(
     const input = (event.target as HTMLFormElement).querySelector(`#${property}`);
     if (input instanceof HTMLInputElement) {
       (container.properties as any)[property] = input.value;
-      if (INPUT_TYPES[property] === 'number') {
-        (container.properties as any)[property] = Number(input.value);
-      } else {
-        (container.properties as any)[property] = input.value;
-      }
     }
   }
 
diff --git a/src/Components/Editor/Behaviors/RigidBodyBehaviors.ts b/src/Components/Editor/RigidBodyBehaviors.ts
similarity index 81%
rename from src/Components/Editor/Behaviors/RigidBodyBehaviors.ts
rename to src/Components/Editor/RigidBodyBehaviors.ts
index b683baa..116fbc4 100644
--- a/src/Components/Editor/Behaviors/RigidBodyBehaviors.ts
+++ b/src/Components/Editor/RigidBodyBehaviors.ts
@@ -1,13 +1,5 @@
-/**
- * @module RigidBodyBehaviors
- * Apply the following contraints to the `container` :
- * - The container must be kept inside its parent
- * - The container must find an unallocated space within the parent
- * If the contraints fails, an error message will be returned
- */
-
-import { IContainerModel } from '../../../Interfaces/IContainerModel';
-import { ISizePointer } from '../../../Interfaces/ISizePointer';
+import { IContainerModel } from '../../Interfaces/IContainerModel';
+import { ISizePointer } from '../../Interfaces/ISizePointer';
 
 /**
  * "Transform the container into a rigid body"
@@ -90,7 +82,7 @@ function constraintBodyInsideSpace(
   if (containerX < x) {
     containerProperties.x = x;
   }
-  if (containerX + containerWidth > x + width) {
+  if (containerX + containerWidth > width) {
     containerProperties.x = x + width - containerWidth;
   }
 
@@ -98,7 +90,7 @@ function constraintBodyInsideSpace(
   if (containerY < y) {
     containerProperties.y = y;
   }
-  if (containerY + containerHeight > y + height) {
+  if (containerY + containerHeight > height) {
     containerProperties.y = y + height - containerHeight;
   }
 
@@ -112,7 +104,7 @@ function constraintBodyInsideSpace(
  * @param container
  * @returns Updated container
  */
-export function constraintBodyInsideUnallocatedWidth(
+function constraintBodyInsideUnallocatedWidth(
   container: IContainerModel
 ): IContainerModel {
   if (container.parent === null) {
@@ -122,7 +114,12 @@ export function constraintBodyInsideUnallocatedWidth(
   // Get the available spaces of the parent
   const availableWidths = getAvailableWidths(container.parent, container);
   const containerX = Number(container.properties.x);
-  const containerWidth = Number(container.properties.width);
+
+  // Sort the available width to find the closest one
+  availableWidths.sort(
+    (width1, width2) =>
+      Math.abs(width1.x - containerX) - Math.abs(width2.x - containerX)
+  );
 
   // Check if there is still some space
   if (availableWidths.length === 0) {
@@ -131,24 +128,6 @@ export function constraintBodyInsideUnallocatedWidth(
     );
   }
 
-  const middle = containerX + containerWidth / 2;
-  // Sort the available width to find the space with the closest position
-  availableWidths.sort(
-    (width1, width2) => {
-      let compared1X = width1.x;
-      if (width1.x < containerX) {
-        compared1X = width1.x + width1.width - containerWidth;
-      }
-
-      let compared2X = width2.x;
-      if (width2.x < containerX) {
-        compared2X = width2.x + width2.width - containerWidth;
-      }
-
-      return Math.abs(compared1X - middle) - Math.abs(compared2X - middle);
-    }
-  );
-
   // Check if the container actually fit inside
   // It will usually fit if it was alrady fitting
   const availableWidthFound = availableWidths.find((width) =>
@@ -200,18 +179,17 @@ function getAvailableWidths(
   const width = Number(container.properties.width);
   let unallocatedSpaces: ISizePointer[] = [{ x, width }];
 
-  // We will only uses containers that also are rigid or are anchors
-  const solidBodies = container.children.filter(
-    (child) => child.properties.isRigidBody || child.properties.isAnchor
+  // We will only uses containers that also have the rigid bodies
+  // as out-of-bound or enormouse containers should be ignored
+  const rigidBodies = container.children.filter(
+    (child) => child.properties.isRigidBody
   );
 
-  for (const child of solidBodies) {
+  for (const child of rigidBodies) {
     // Ignore the exception
     if (child === exception) {
       continue;
     }
-    const childX = child.properties.x;
-    const childWidth = Number(child.properties.width);
 
     // get the space of the child that is inside the parent
     let newUnallocatedSpace: ISizePointer[] = [];
@@ -224,8 +202,8 @@ function getAvailableWidths(
       const newUnallocatedWidths = getAvailableWidthsTwoLines(
         unallocatedSpace.x,
         unallocatedSpace.x + unallocatedSpace.width,
-        childX,
-        childX + childWidth
+        child.properties.x,
+        child.properties.x + Number(child.properties.width)
       );
 
       // Concat the new list of SizePointer pointing to availables spaces
@@ -284,7 +262,7 @@ function getAvailableWidthsTwoLines(
       width: min2 - min1
     },
     {
-      x: max2,
+      x: min2,
       width: max1 - max2
     }
   ];
diff --git a/src/Components/ElementsSidebar/ElementsSidebar.test.tsx b/src/Components/ElementsSidebar/ElementsSidebar.test.tsx
index 8d34480..f1776c0 100644
--- a/src/Components/ElementsSidebar/ElementsSidebar.test.tsx
+++ b/src/Components/ElementsSidebar/ElementsSidebar.test.tsx
@@ -17,8 +17,7 @@ describe.concurrent('Elements sidebar', () => {
           y: 0,
           width: 2000,
           height: 100,
-          isRigidBody: false,
-          isAnchor: false
+          isRigidBody: false
         },
         userData: {}
       }}
@@ -48,8 +47,7 @@ describe.concurrent('Elements sidebar', () => {
         y: 0,
         width: 2000,
         height: 100,
-        isRigidBody: false,
-        isAnchor: false
+        isRigidBody: false
       },
       userData: {}
     };
@@ -105,8 +103,7 @@ describe.concurrent('Elements sidebar', () => {
         y: 0,
         width: 2000,
         height: 100,
-        isRigidBody: false,
-        isAnchor: false
+        isRigidBody: false
       },
       userData: {}
     };
@@ -122,8 +119,7 @@ describe.concurrent('Elements sidebar', () => {
           y: 0,
           width: 0,
           height: 0,
-          isRigidBody: false,
-          isAnchor: false
+          isRigidBody: false
         },
         userData: {}
       }
@@ -140,8 +136,7 @@ describe.concurrent('Elements sidebar', () => {
           y: 0,
           width: 0,
           height: 0,
-          isRigidBody: false,
-          isAnchor: false
+          isRigidBody: false
         },
         userData: {}
       }
@@ -178,8 +173,7 @@ describe.concurrent('Elements sidebar', () => {
         y: 0,
         width: 2000,
         height: 100,
-        isRigidBody: false,
-        isAnchor: false
+        isRigidBody: false
       },
       userData: {}
     };
@@ -194,8 +188,7 @@ describe.concurrent('Elements sidebar', () => {
         y: 0,
         width: 0,
         height: 0,
-        isRigidBody: false,
-        isAnchor: false
+        isRigidBody: false
       },
       userData: {}
     };
diff --git a/src/Components/Properties/Properties.test.tsx b/src/Components/Properties/Properties.test.tsx
index 9fbef37..2afc364 100644
--- a/src/Components/Properties/Properties.test.tsx
+++ b/src/Components/Properties/Properties.test.tsx
@@ -23,8 +23,7 @@ describe.concurrent('Properties', () => {
       parentId: 'parentId',
       x: 1,
       y: 1,
-      isRigidBody: false,
-      isAnchor: false
+      isRigidBody: false
     };
 
     const handleChange = vi.fn((key, value) => {
diff --git a/src/Components/Properties/PropertiesInputTypes.tsx b/src/Components/Properties/PropertiesInputTypes.tsx
index d91ddbc..c62a8fd 100644
--- a/src/Components/Properties/PropertiesInputTypes.tsx
+++ b/src/Components/Properties/PropertiesInputTypes.tsx
@@ -3,6 +3,5 @@ export const INPUT_TYPES: Record<string, string> = {
   y: 'number',
   width: 'number',
   height: 'number',
-  isRigidBody: 'checkbox',
-  isAnchor: 'checkbox'
+  isRigidBody: 'checkbox'
 };
diff --git a/src/Interfaces/IEditorState.ts b/src/Interfaces/IEditorState.tsx
similarity index 100%
rename from src/Interfaces/IEditorState.ts
rename to src/Interfaces/IEditorState.tsx
diff --git a/src/Interfaces/IProperties.ts b/src/Interfaces/IProperties.ts
index ef2db7e..4996ce5 100644
--- a/src/Interfaces/IProperties.ts
+++ b/src/Interfaces/IProperties.ts
@@ -1,21 +1,11 @@
 import * as React from 'react';
 import { XPositionReference } from '../Enums/XPositionReference';
 
-/**
- * Properties of a container
- * @property id id of the container
- * @property parentId id of the parent container
- * @property x horizontal offset of the container
- * @property y vertical offset of the container
- * @property isRigidBody if true apply rigid body behaviors
- * @property isAnchor if true apply anchor behaviors
- */
 export default interface IProperties extends React.CSSProperties {
   id: string
   parentId: string | null
   x: number
   y: number
   isRigidBody: boolean
-  isAnchor: boolean
   XPositionReference?: XPositionReference
 }
diff --git a/src/utils/default.ts b/src/utils/default.ts
index 2bd22dc..785a840 100644
--- a/src/utils/default.ts
+++ b/src/utils/default.ts
@@ -33,7 +33,6 @@ export const DEFAULT_MAINCONTAINER_PROPS: IProperties = {
   width: DEFAULT_CONFIG.MainContainer.Width,
   height: DEFAULT_CONFIG.MainContainer.Height,
   isRigidBody: false,
-  isAnchor: false,
   fillOpacity: 0,
   stroke: 'black'
 };