Use the following procedure to specify whether and how a wall join cleans up in an active plan view.
Click Modify tabGeometry panel (Wall Joins).
Move the cursor over the wall join, and click within the gray square that displays.
On the Options Bar, for Display, select one of the following options:
Clean Join. Displays a smooth join. While the join is selected for editing, temporary solid lines indicate where the wall layers actually end, as shown below; these lines disappear when you exit the Wall Joins tool and do not print.
Don't Clean Join. Displays the wall ends butting up against one another as shown.
Use View Setting. Cleans wall joins according to the view’s Wall Join Display instance property (see View Properties). This property controls whether the cleanup applies to all wall types or only to walls of the same type.