Re: TS4 Gallery: Mass Deleting

There isn't a way to mass delete the creations you've saved to the gallery. Unfortunately you have to delete them one by one.

If you have your Tray folder from your Sims 4 folder backed up or the families, houses, etc that are most important, you can "mass-delete" everything from your My Library tab by deleting the tray folder.  -  It will be recreated next time to play the game.