Menu bars disappear. I don't want them to
The menu bar suddenly started behaving like the dock - appearing when cursor is on it, disappearing when cursor moves away. I want the menu bar of finder and all programs plus, on the right, the date, time, connection status and other things, to always be there, for whatever program is active in addition to the finder, like it always was for years and years. This just started today and I want the menu locked in place again. I don't know how. thanks for help
Mac mini, macOS 10.12