If you are not switching profiles in Chrome browser, that piece of window realestate next to minimize and maximize buttons can be valuable. The profiles button will prevent that space being used by tabs, which can get really annoying. Fortunately, there is a way to turn it off.
Turning the button off does not take away any functionality. You can still switch profile as before, by opening the menu and checking or clicking the "signed in as..." menu item, and you can still open an incognito window.
Hope this becomes a standard setting in options.
navigate to about://flags and flip the flag for --enable-new-avatar-menu to off