Those are fine, what there is from the horse’s mouth is next to useless:
https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/repair-the-boot-menu-on-a-dual-boot-pc?view=windows-11
Visual BCDEdit would be terrific if it could show gui forms when run from a recovery disk, indeed something like XTGold from early DOS would be a blast. 😛