In Mac version of Verbum 9.0 SR-2
Steps I used to reproduce (may also be true for Logos):
1. Open Verbum
2. Maximize it
3. Open Exegetical Guide (I tried Passage Guide too, same thing; I assume it's in other guides)
4. Type in any bible verse to bring up results - all sections can be collapsed too
5. Click the Add drop down in the top right corner, to add other sections to the guide - nothing happens! Its like there is no room for the popup Add Panel.
6. Get out of full screen. Now, clicking Add shows the popup pane.