To get to the Chrome Menu button simply hit ALT and focus will be thrown to it. Then hit Enter to open the menu choices.
After this, you can either down arrow to Settings and hit Enter or just hit S as that first letter activates it, either way the settings tab will open and focus will be thrown to it.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore