Move something around and realize you liked it where it was before?
- Click CMD+Z (on Mac) or CTRL+Z (on Windows) on your keyboard to revert your changes
- Click CMD+SHIFT+Z (on Mac) or CTRL+SHIFT+Z (on Windows) on your keyboard to revert your changes
Note that this will only function with your current editing session. This will not work for going back to previous versions after you've closed your tab.