Answer
When walls are drawn in a plan, their height is determined by the default ceiling height for rooms on the current floor. The ceiling height can also be changed on a room-by-room basis. The height of all walls defining a room will be identical and based on the height of the ceiling in that room.
To set the default ceiling height, go to Edit > Default Settings > Floor, then go to the Structure tab and change the ceiling values.

To change the default ceiling height on a different floor, go to that floor and follow the same instructions above.
Note: Changes made in the Floor Defaults will affect all the rooms that are using the default ceiling height.
To specify the ceiling height for a single room, select the room then click the Open Object button.
Under the Room Specification dialog box, go to the Structure tab and change the ceiling height.
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