"Select all unused" triggers "Small panel rows" in Styles palette
STR: Select "Select all unused" in Paragraph or Character Styles pallet
ER: Should select all styles not used in current document
AR: Triggers "Small panel rows" instead
Kelly Vaughn commented
This also happened for me when trying to choose "Synchronize Options" from the Book panel flyout.
Scott Parish commented
Restarting InDesign resolved the issue.