UnhidingAllHiddenFiles wrote: … How do I permanently unhide them all at once without having to unhide them individually?
Go to the Hidden view, select all, select more (•••), then Unhide.
The pictures will no longer be in the Hidden view, so it would be a trick to hunt them all down again to hide them.
Here's a way to overcome that: Before you Unhide them all, go to Hidden, Select All, (be sure to get them all,) then go to More (•••) and choose Add to Album. Hit + to create a new album-- name it MyHidden, or something. It's weird, because when you look in this album it will be empty! They're all hidden!
Then, when you want to look at the pictures, you can go to Hidden, select them all, and choose UnHide. They will disappear from Hidden, which will now be empty, and all your hidden pictures will be visible in whatever albums they come from. Then you can see them in My Hidden, and you they will respond to searches. When you're through, you can go to MyHidden and re-hide them all.
If you add more pictures to Hidden, be sure to add them to My Hidden, as well, so you don't lose track of them if you ever unhide them.
Does this work for you?