Click on the wall, whether it's a straight, curved wall or room divider, to select it.

This will open the wall's properties panel on the left side of the interface. Open the "Wall" tab.

In the properties panel, locate the "Shift" section.

Input the value in mm in the input box under "Right". Input the value in positive to shift on right side, input the value in negative to shift on left side.

Input the value in mm in the input box under "Down". Input the value in positive to shift towards down, input the value in negative to shift towards up.

Press enter to make the change.