Hi,
I installed Leap 15.6, but in boot options I got 3rd option “UEFI firmware settings” (beside boot 156 and Advanced boot). Is there any way to turn that option odd, because it leads to Bios settings?
Thank you for answering my questions.
Move the file
/etc/grub.d/30_uefi-firmware
(on your system the filename may start with a number different to 30) to a secure destination (for backup).
Then run (as user “root” in a konsole/virtual terminal)
grub2-mkconfig -o /boot/grub2/grub.cfg
When restarting your system the boot entry for UEFI firmware should be gone.
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This is such a brilliant! Thank you, my friend(s)! 
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It will be reinstalled on update. Better is to edit this file and add exit 0 as the very first command. These files are marked as %config %noreplace and so changes will be preserved.
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