Chromium Stuck Maximized [SOLVED]

Not just you, I've seen that kinda thing before for sure, internal minimize button not working.

You can get a window menu several ways to minimize it. If you're using chromiums client-side-decoriations (no moksha title bar) then you don't have the corner icon to click on, but you can right click on its entry in tasks, or Left_Alt+Right_Click in the middle of the app. In either case, select Window then "iconify". Iconify means minimize. You can also use Win+M keyboard shortcut to directly minimize.