Not sure I can help but how are you reaching the boot options screen?
One of the "new" Windows 10 recommended ways is to right click the Windows logo, click Settings then Update and Security then Recovery then Restart Now under Advanced startup. You then see some options including choosing where you want to boot from.
I expect you'll only see the same as you are already seeing though, and I've not yet considered why this is an improvement on the old method of tapping a function key at startup to get the BIOS screen up.
Conceivably your menu may only offer options which are actually available i.e. if you put in a bootable USB device that might cause it to appear in the menu. Many years ago that's how our mini-computers worked.
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Boot option query. new