The last method you can use to delete a user account on Windows 11 is the User Accounts dialog, though this one is actually a bit hard to find unless you know specifically what you're looking for.

To view all user accounts registered on your Windows PC, navigate to Settings > Accounts > Other users. Click to expand a user account, and you will have the option to remove it.

You can delete a User Account in Windows 11/10 using Settings, Control Panel, or Command line. Make sure to backup your data and user files first.