Grub2 is a popular bootloader for BIOS and UEFI systems. It typically displays boot entries in a black background during system start. Each of these boot entries seem to be a reference to a set of configuration instructions that are defined in files. Such files are located under /boot/loader/entries/ according the the man page of grubby.

user1@rhel10-vm2:~$ ls /boot/loader/entries/
ls: cannot open directory '/boot/loader/entries/': Permission denied
user1@rhel10-vm2:~$ 
user1@rhel10-vm2:~$ sudo ls /boot/loader/entries/
995c0067e7c140f28c8539b917f55418-0-rescue.conf
995c0067e7c140f28c8539b917f55418-6.12.0-55.43.1.el10_0.x86_64.conf
user1@rhel10-vm2:~$ 

When my lab VM is booting, grub2 shows only two boot entries. And I found only two files under /boot/loader/entries/.