The bottom bar
On the far left, you see a shortcut to get help. Next, you can see a list of users in the same branch as you. Third, you have Undo and Redo buttons (Shortcuts โ/CTRL+Z and โ/CTRL+SHIFT+Z) Fourth from the left are zoom controls. You will find a play/pause button fifth from the right, which lets you toggle between Edit mode and Test mode. Just before the blue publish button, is the preview button, which opens the current page in a new preview tab. Finally, we have the Publish button, which will let you publish the changes you make to the current branch.