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$ sudo grubby --info=ALL
index=0
kernel="/boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64+debug"
args="ro crashkernel=auto resume=/dev/mapper/rl-swap rd.lvm.lv=rl/root rd.lvm.lv=rl/swap rhgb quiet console=ttyS0,115200n8 console=tty1"
root="/dev/mapper/rl-root"
initrd="/boot/initramfs-4.18.0-477.10.1.el8_8.x86_64+debug.img"
title="Rocky Linux (4.18.0-477.10.1.el8_8.x86_64+debug) 8.8 (Green Obsidian)"
id="fe8567dfe90b49c5a4f20a22a12cbc66-4.18.0-477.10.1.el8_8.x86_64+debug"
index=1
kernel="/boot/vmlinuz-4.18.0-425.19.2.el8_7.x86_64"
args="ro crashkernel=auto resume=/dev/mapper/rl-swap rd.lvm.lv=rl/root rd.lvm.lv=rl/swap rhgb quiet console=ttyS0,115200n8 console=tty1"
root="/dev/mapper/rl-root"
initrd="/boot/initramfs-4.18.0-425.19.2.el8_7.x86_64.img"
title="Rocky Linux (4.18.0-425.19.2.el8_7.x86_64) 8.7 (Green Obsidian)"
id="fe8567dfe90b49c5a4f20a22a12cbc66-4.18.0-425.19.2.el8_7.x86_64"
index=2
kernel="/boot/vmlinuz-0-rescue-fe8567dfe90b49c5a4f20a22a12cbc66"
args="ro crashkernel=auto resume=/dev/mapper/rl-swap rd.lvm.lv=rl/root rd.lvm.lv=rl/swap rhgb quiet console=ttyS0,115200n8 console=tty1"
root="/dev/mapper/rl-root"
initrd="/boot/initramfs-0-rescue-fe8567dfe90b49c5a4f20a22a12cbc66.img"
title="Rocky Linux (0-rescue-fe8567dfe90b49c5a4f20a22a12cbc66) 8.6 (Green Obsidian)"
id="fe8567dfe90b49c5a4f20a22a12cbc66-0-rescue"

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$ sudo grubby --default-kernel
/boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64+debug
$ sudo grubby --default-index
0

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$ sudo grubby --set-default-index=0
The default is /boot/loader/entries/fe8567dfe90b49c5a4f20a22a12cbc66-4.18.0-477.10.1.el8_8.x86_64+debug.conf with index 0 and kernel /boot/vmlinuz-4.18.0-477.10.1.el8_8.x86_64+debug