Someone asked me this question today so I thought I would investigate. Keep in mind that our color scheme is applied to rooms. If you have the view display set to course, the hatch runs to the center of the wall and ignores the wall fill. If you set the view to medium or fine and set the material fill of the walls to be solid white, then the hatch boundary "stops" at the wall faces. It may not be a complete solution, but it solved our problem. In our case, all of the walls in our project were using the "default wall" for material, so we globally edited the material through Manage tab>Object Styles>Model Objects>Walls> change the default wall material to a material with Graphic properties- Cut Pattern >Solid fill, white. You may also apply this material per view instead of globally through visibility graphics.
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