1 - Select the game in your library with the left mouse button

2 - Press the right mouse button to bring up the menu

3 - Move the mouse over the manage option to display it

4 - Click the left mouse button on the Uninstall option

5 - Click the left mouse button on the Uninstall option in the confirmation window

6 - Decide what you are going to do with all the time you are going to have from now on