I've had similar issues where the 2D representation doesn't match the 3D view. You could try adjusting the wall intersections manually by using the "Edit Wall Intersection" tool. It might give you more control over the brick ledge and help you achieve the desired result in 2D. Also, ensure you've checked the wall settings and alignments to ensure consistency. However, I have the same ledges in my living room as in your picture, and it doesn't look that bad. Moreover, it's easy to clean with hospital mops and equipment. Anyway, I hope that helps!