Steam displays every game you've ever bought or received as a gift in your library. It also remembers some free games that you have installed. However, you can hide a game from your library, or even permanently delete it from your account.
The difference between hiding and removing games
Hiding is reversible. When you hide a Steam game, it is hidden from the default library views. Someone can still see the game in a few clicks, and you can show the game again in the future. You can even play a hidden game. It's just a way to sweep a game under the carpet.
The removal is permanent. When you remove a game from your Steam account, it will be permanently deleted. The game does not appear in your library. Previously, you had to contact Steam Customer Support to ask, but there is now a standard way to erase games in just a few clicks. Attention: To play the game again in the future, you must buy it again.
Hiding a Steam Game
To hide a Steam game, locate it in your library, right-click it, and then click Set Categories.
Activate the option "Hide this game in my library" and then click on "OK".
How to Find or Reveal a Hidden Steam Game
To view your hidden Steam games, click on the category box on the right Page of the search box in your library and select "Hidden."
Right-click here to display a hidden game, then choose Remove From Hidden
Remove a game from your Steam account
Before you remove a Steam game from your library, you should get it from your Uninstalling a computer If you remove a game from your account first, you can not uninstall it normally – you must verify the files on your hard disk or SSD and manually remove them.
To permanently delete a game Click Help> Steam Support in your library.
Click the game you want to delete. If you played it recently, it will be displayed at the top of the list. If not, you can use the search box at the bottom of this page to search for the game by name.
Click "I want." Remove this game permanently from my account. "(If you have purchased the game in the past two weeks and played for less than two hours, you can also refund the game from here.)
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Steam gives you more information about this process. If the game was purchased or activated as part of a bundle, Steam displays similar games that are also removed.
Click "OK, permanently remove the listed games from my account." You may need to buy the game again. You never want to play it again.
This will not remove any information about your playtime and achievements in the game that are tied to your Steam profile