Photoshop - How to Preview Single Layer

If you’d like to preview a single layer, you can quickly get a look at it on its own by Alt+clicking on the layer’s eye icon in the layers panel. Alt+clicking on the eye icon again will return you to the previous layer visibility state. Note that if you accidentally click on another layer’s eye icon you’ll lose the ability to revert back to the previous state.

I hate when that happens! Especially when you have many layers. If I want to preview a single layer, I save the file first. Then if I ever accidentally click away, I can just File>Revert