How To Uninstall Steam Games
The following steps illustrate the process of uninstalling Steam games from your computer.
Open the Steam App and log in to your account. In the App, click on Library.
In the Library window, scroll down to the ALL section, where you will find all of your purchased games.
To Uninstall an installed game, right-click the game, go to Manage, and click Uninstall in the contextual menu.
Steam will ask for confirmation before uninstalling the game from your PC.