IntelliJ IDEA Tips & Tricks #14: Close Window Using Cmd + W
If you are moving your mouse to move to a window and close it by pressing the "x" symbol, you are spending too much time for that!!
Just press "Cmd + W" and the window will close.
This video shows how you can pop-up the recent files window using Cmd + E. Then select multiple files to open simultaneously. Now, you can close them by selecting Cmd + W.