I normally work with a dual file list. In DOpus 10 it was easy to click on the title bar of a file list and make that the active pane. However, with the new expanded title bar in DOpus 11, that doesn't seem to work. The title bar is filled with arrows and then the path information. Clicking on the path field makes it active but not necessarily the whole file list. This becomes a problem when there is a particular file (or files) already selected in the inactive file list when you want to make it active. In order to do so, it appears that you must click somehwere in the list itself which obviously causes the existing selections to be deselected.
Turn on Preferences / File Displays / Border / Click on destination's toolbar only changes state