Exit full screen

I have installed El Capitan (given this is a family site, I’ll leave out the ##$!!, @$$!, and %%$$@ descriptors). Among other irritations, Scrivener now defaults to full screen mode. When I’m in the normal writing mode, I can go to the dock at the bottom of the page, which makes a leisurely appearance, then select another program. When I’m in Project Notes, El Cap grabs the machine by its soft nether parts and forces full screen. No amount of will get out. Again, drop to dock … wait… hit Scrivener … back to text.

Any ideas?