MakeItWork26 wrote:
• MacBook Pro M5.
Menu bar won't show in full screen when:
hover cursor at top of screen
• or even when change menu bar settings to always show menu bar.
True in Firefox and in Safari. So can't quickly check time, for instance, unless I leave full screen (by using control, command F).
How can I fix this?
Make changes to Menubar settings...to elicit some change and test, only then come back to you preferred settings ...

no resolve—
—A SafeBoot Start up your Mac in safe mode - Apple Support will sort many anomalies
Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled temporarily.
Login and test. Reboot as normal and test. Caches get rebuilt automatically.
This test will tell you if third party interference; most extensions etc are not loaded in safe boot mode.
*** (if you are using a wireless keyboard with rechargeable batteries— connect the charging cable, this will make the wired keyboard successful Safe Boot your Mac.)
—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support
This will tell you if it a universal issue or isolated to your user/admin account.