Agree about rubber design, it needs too much work. Maybe just option on/off for one line menu in settings? If people have big screens they will be using it for sure, less menus - faster work. If they have small screen iPad or use it in a vertical orientation, then they just won’t turn it on in settings. I think it’s easier to add then autohiding of menu.
At the moment, this menu looks a bit out of place. It pulls down all opened panels (color, reference, layers, etc) for the height of this bar. Also it makes canvas less size when quick pinch it.