This guide will let you know how to turn off the Friend Playing Game notification on Steam. Go through the guide and follow the simple steps to do so.
1. You will need to click on Friends on the top left side of the Steam Interface and then click on View Friends list.
2. And then click on settings on the top right side of the window.
3. In the friend list menu, you have to select notifications and unselect “When a friend joins a game” in the notifications menu. That’s it
