term1 !term2means "term1 AND NOT term2".
Look for the ? icon to the right of the search bar; it will open a useful help drawer.
Menu actions (orange button bottom right corner) affect all designs that match the current search critiera...
EXCEPT if you click on individual design checkboxes. Then actions only affect the checked ones.
Be careful bulk editing your designs! All changes are automatically synced to any published exhibits.
NEW! Not mentioned in the video:
You can click and drag to select (check) multiple designs.