In fullscreen on mac when trying to close and change between tabs the toolbar keeps dropping down

As with title, when I am in fullscreen with Acrobat on its own desktop I am experiencing a problem.

Whenever I try to change tab and especially close a tab by clicking the x button the toolbar drops down to obscure the tabs forcing me to slowly, like a thief in the night, creep up on the x unawares and swiftly deliver the killing blow.

Is there a setting that enables me to keep the Mac toolbar at the top of the screen always visible in fullscreen mode?

Thanks,