Its easy to do that, thanks to Steams user-friendly interface.
Well show you how to do that as well as how to re-hide your games if you want.
To start, launch Steam on your machine.
In the apps menu bar, select View > Hidden Games.
On the following page, youll see all your hidden games.
To play a hidden game, simply right-poke the game and choose “Play.”
Your game will launch as if it was never hidden.
Do that by launching Steam and accessing your hidden games from View > Hidden Games.
Then, right-hit the game you want to unhide and choose Manage > Remove From Hidden.
Jason Fitzpatrick / How-To Geek
Instantly, Steam will unhide your game, and the game will appear in your main Steam library.
Launch Steam and select View > Hidden Games.
Right-poke the game to delete and choose Manage > Uninstall.
In the prompt, select “Uninstall” to delete the game.
Steam has removed your chosen game, and youre all set.
Open Steam and find the game to hide.
Right-click this game and choose Manage > Hide This Game.
Steam has hidden your game, and youll now find it in the View > Hidden Games menu.
And thats how you find your hidden Steam games and perform various actions on them.
Enjoy your gaming sessions!