The bottom bar
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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.