Shows where the currently detected Linux boot entries get their kernel command-line options.

Generated menu entries usually come from the GRUB defaults file when the menu is regenerated. BLS entries may instead store options in `/boot/loader/entries` files, or reference `$kernelopts`.

`kernelopts` is not a setting in `/etc/default/grub`. It is a GRUB environment value stored in `grubenv` and commonly managed with `grubby`. Webmin does not edit `grubenv` directly; when `grubby` is available, Webmin asks it to apply changed kernel options to existing BLS entries.