missing“Automatically hide and show the menu bar”

To change these preferences, choose Apple menu  > System Preferences, then click Dock & Menu Bar.

Automatically hide and show the menu bar is at the very bottom of that screen.

Select the checkbox to show the menu bar only when you move the pointer to the top of the screen. To always show the menu bar, deselect the checkbox.

Go to SystemPreferences, Dock and menubar. Click on the left side on Dock and menubar and look at the right side at te bottom, there you can select your option