Hi, sorry for the inconvenience, I accidentally hid a game and now I don't know where to find it. Could someone help me find it?

Are you using galaxy ?

If so go to Owned games then, at the top middle of the screen click on Filter then Status and check Hidden

hope it helps :)

Go to your account.
Besides "My Collecton", there's an arrow.
Click that arrow and a menu opens.
In that menu, choose "Hidden".
Hover your mouse over the game you want to unhide - an arrow appears.
Click on that arrow - a menu opens.
In that menu, click on UNHIDE GAME.

Done!