You can determine the wall heights from the format settings section in the hall settings dialog.
Location of the Wall Height Setting
Select the hall where you want to change the wall height and click the right mouse button. Click the Properties line from the right click menu that opens.
Enter the hall settings.
Enter the new height value in the w 1 and w 2 box.
Enter new values for the front and back wall heights.
Wall height will change according to the values you entered.
Hall view before changing the wall height
Hall view after changing w 1 50 cm and w 2 200
Hall view after changing the front and back wall height to 200 cm