Top toolbar disappeared, can't get it back

Hey guys.

Been trying to figure this out for an hour now, gone through all the menus and I can’t seem to figure out where my top toolbar went (the one that usually resides above the measure markers in the edit window)
I didn’t consciously disable it. Must have hit something, somehow.
any ideas? I’m stumped.

Far left of toolbar 3 rectangle icon. Set Up Window Layout.