Using latest SlickEdit on Macbook Mountain Lion. I'm doing a history diff which shows three panes: (left) the revisions available, (middle) current file, (right) revision 0 (which is the one I chose to compare). The trouble is that I don't see any way to narrow or remove the left pane. The code I'm comparing is wide and I'd like to take advantage of the screen real estate. Is there a way I can have the left pane use less width? I assume I'm using diffzilla, but the title bar only says "History Diff - Backup History - (file name)".