Eject on menu bar shows “No Drives” even though an external drive is connected

Place a foot in the door.

• On each of your disks, create a text file, open it in TextEdit, add some line, and leave the file open unsaved.

I think this trick will prevent ejection.

Test this trick, try to eject the disk and come here tell us the result.

This trick can easily be automated.

Try setting your dock to autohide while leaving the displays with separate spaces. Also make your video playing app fullscreen before using the fullscreen feature built into the app.

This answer says that the menu bar cannot be hidden, but it shouldn't be showing up in full screen unless you place your mouse over the top of the second monitor.