The Steam overlay allows you to access the Steam community, browser, and other features in-game.
1.Open the Steam client.
2.Go to Steam > Settings.
3.Click on the In-Game tab.
4.Uncheck the Enable the Steam Overlay while in-game box.

The Steam overlay allows you to access the Steam community, browser, and other features in-game.
1.Open the Steam client.
2.Go to Steam > Settings.
3.Click on the In-Game tab.
4.Uncheck the Enable the Steam Overlay while in-game box.
