They call it a hamburger menu, so that’s something to search here for. Here’s one post that could be useful: Customizing the Hamburger Menu - #2 by JimPas
Also search for the American “customize” 
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They call it a hamburger menu, so that’s something to search here for. Here’s one post that could be useful: Customizing the Hamburger Menu - #2 by JimPas
Also search for the American “customize”