It happened to me quite a lot of times, that i somehow turned off toolbars, but then can't remember, which names they have. So i have to go through maybe 30 of them, trying one after the other, closing the wrong one, trying the next etc.
When i look into the preferences under tool bar sets, i see only three of them. Maybe some kind of function would be handy, to color the most important ones, or some sort of favorites. I would have cleaned up those mostly very old experimental tool bar sets (or tool bars), but i have no idea where they actually are (supposedly in some of Opus' config files).