Preventing the Dock from Remaining Visible in Fullscreen Applications

I wasn't saying you were faking. What I am saying is if your Dock is not showing/hiding while in Full Screen your Mac in particular is not behaving correctly. You shouldn't need a workaround, it should be fixed. See if it does the same thing while in Safe Mode or if you log in to a new user account.

Use safe mode to isolate issues with your Mac - Apple Support

G.C.Thompson wrote:

Hi, yes that's certainly possible, but not what was happening in my screenshot. In fact, since I have Magnification enabled in Dock Preferences, what I actually see in that scenario is this:

There's nothing to be gained by my 'faking' the behaviour, I'm just reporting what I've experienced in the hope that either (a) someone will see the post and let me know of a 'better' workaround, or (b) the post will help other users experiencing the same behaviour.

Try changing the location of the Dock, right or left side an test. Move the Dock back to the bottom and test.

Could be a corrupt plist.

From Finder>Go>Go To Folder , copy an paste:

~/Library/Preferences/com.apple.dock.plist

move this plist to the desktop (to delete later or return if no change) and either restart your Mac or from terminal copy and paste:

killall Dock

The plist will rebuild to default.

if no change you can run the http://etrecheck.com to see if there is something interfering, like antivirus, Cleaners, etc that could be corrupting.

Yes, I can make the same screen shot simply by switching Safari into Full Screen, then moving the cursor to the bottom of the screen where it will show or hide as if the Dock was set to show and hide even though it isn't. That's the default behavior when in Full Screen.

Never had the Dock remain open while in Full Screen. As a matter of fact you have to mouse down to the bottom of the screen twice to get it to appear.