The View menu in DEVONthink and DEVONnote lets you do more than just switch between the various views. Check View > Widescreen to adjust the split and three-panes layouts for wide screens; uncheck this option for a layout fitted to smaller screens.
Check View > Cover Flow to activate iTunes-like display of group contents. When this option is checked and a group is selected DEVONthink shows the contents in the familiar Cover Flow style. This option is not available in DEVONnote.