Steam shows all game you have purchased or received as a gift in the steam library. It remembers some free games you have ever installed. But you can remove or hide a game from your library—or even can permanently delete/remove it from your account.
The Difference Between Removing and Hiding Games
Removing is permanent. When you want to remove a game from your Steam account, it will permanently be deleted. The game will never appear in your library in the future. Previously you had to contact the Steam customer support team and ask for this, but now there is a standard way to delete games in a few clicks. Beware about it: want to play the game again in the future, you’ll have to repurchase it.
Hiding is reversible. When you will hide Steam games, they hidden from the standard library views. You can still see the game with a few clicks, and you can also unhide the games in the future. You can even play hidden games.
How to Hide a Steam Game
To hide a Steam games, located it in your library, right-click on it, and then click “Set Categories.” See in Picture
Check on the “Hide this game in my library” option and then click on “OK.”
How to Find or Un-hide a Hidden Steam Games
If you want to view your hidden Steam games, click on the category box at the right side of the search box in your steam game library and then select “Hidden.” see in the picture below.
To unhide a hidden games, right-click on it here and then select “Remove From Hidden.”
How to Remove a Game permanently From Your Steam Account
Before removing a Steam game permanently from your library, you must have uninstalled it from your computer first. If you will remove a game from your account first, you won’t be able to uninstall it normally—you have to hunt down its files on your hard drive and remove them manually.
To delete a game permanently from your library, click Help > Steam Support.
Click on the game which you want to delete. If you have played it recently, it will appear on the top of the list. If you have not played, you can use the search box at the bottom of the following page to search for the game by name.
Click on “I want to permanently remove this game from my account.”
Steam will give you more information about this procedure. If your games were purchased or activated as part of a bundle, Steam would show related games that will also be deleted.
Click “OK, remove the listed games from my account permanently.” You will have to re-purchase the games if you ever want to play it again.
This will not remove information about your achievements and playtime in the game, which will remain tied to your Steam profile.