Open a folder and open a file in that folder. You can now see 2 folders on the left sidebar of Atom editor; named "Pane" which shows currently opened files and second being your project folder.
Press Ctrl + \ to hide the left sidebar of the Atom editor.
Press Ctrl + \ again to show the left sidebar of the Atom editor. Now you can see only project folder. The "Pane" folder which shows the opened files is gone.
If you can't reproduce the problem then tell me and I'll send you the packages I've installed.
How to reproduce the error:-
If you can't reproduce the problem then tell me and I'll send you the packages I've installed.
Kind Regards, Omar