Adobe Lightroom Tip:
Expanding and Collapsing all Subitems

In Adobe Photoshop Lightroom there are many places where you might want to expand or collapse multiple items all at once; the Folders list, Collections list, or keywords list for example.

If you hold the alt key (option on mac) and click the triangle next to the entry to expand or collapse it, it will expand or collapse that entry and any sub entries that can also be expaned or collapsed.

Taking it a step further alt clicking on the panels themselves will switch them into solo mode, where only the active panel will be expanded, and everything else will just be a title. You can tell if the panels are in solo mode because their open/close arrows go from being solid to being dotted.

One final tip, control (command on a mac) clicking a panel title will expand or collapse all pannels on that side of the screen.