You can add a GRUB_TOP_LEVEL line to your /etc/default/grub. See here:
So, for the regular linux kernel, you’d add the following line to /etc/default/grub:
GRUB_TOP_LEVEL="/boot/vmlinuz-linux"
Save the change, then regenerate your grub with sudo grub-mkconfig -o /boot/grub/grub.cfg.
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