Move the Selected Edge Only
You only move the edge of the selected wall volume by selecting the appropriate function in the context-sensitive menu of the middle grip point.

- Select a wall.
 - Select the wall volume.
 - Activate the middle grip point of the edge by moving the cursor close to the point.
 - Right-click to open the context-sensitive menu.
 - Select 
 Move
          Selected Edge Only. - Select the location. The edge of the adjacent wall volume will not move.
 

- Quit by pressing the Esc key.
 
