How to Close Multiple Panes in Sublime Text 3
To close multiple panes in Sublime Text 3 use the following key combination :
1 of macOs and on Windows/Linux use
Alternatively, you can go to
Single on the main menu.
Here is the full list of keyboard shortcuts for opening panels in Sublime Text 3:
Each number corresponds to the number of panels to split the window by.
I opened multiple panels in my Sublime Text 3 accidentally with a key combination and didn't know how to close them, so I thought it might be useful posting the solution here for others.