How to modify boot menu, boot menu options, and kernel options?

grub.cfg does control the basic behavior of grub and booting. Are you sure you are installed and booting via UEFI? Your /boot/efi/EFI/rocky directory does not appear normal.

[root@xmpp01 ~]# ls -l /boot/efi/EFI/rocky/
total 6100
-rwx------. 1 root root     130 Nov 17 22:29 BOOTX64.CSV
-rwx------. 1 root root     144 Jul 14  2022 grub.cfg
-rwx------. 1 root root    7028 Jul 14  2022 grub.cfg.rpmsave
-rwx------. 1 root root 2525120 Feb 14 12:06 grubx64.efi
-rwx------. 1 root root  856856 Nov 17 22:29 mmx64.efi
-rwx------. 1 root root  947216 Nov 17 22:29 shim.efi
-rwx------. 1 root root  947216 Nov 17 22:29 shimx64.efi
-rwx------. 1 root root  939648 Nov 17 22:29 shimx64-rocky.efi

You’re missing many efi files. You might want to check if /sys/firmware/efi exists, which will tell you if you are indeed booting via UEFI. You should also have an entirely separate /boot/efi partition, which is a requirement in UEFI scenarios.