Sometimes I managed to accidentally mess up something with the toolbars I did not really want. Perhaps by a bad aimed click and swipe or something. Sometimes this happens, more often if I am in a hurry to do things fast.
I did not found a "toolbar lock feature" which prevents moving toolbars, unlock them and things like that, during normal editing.
Or, perhaps, an "undo" for toolbar changes would do it. But I did not found this either.
Does these features exist already (SE 16) - or are they planned?
If you mess up the toolbars accidentally it is annoying to correct this to the favorite layout.