Thanks. The boot order is already set to windows boot manager> C: system drive. Setting it to just the C: (minus WBM) fails to boot. Uefi is msi.
The issue is a partition was put on there by Macrium. I deleted it, but the windows boot manager is now borked and now I have to manually select windows 10 or wait for it to time out. This adds a lot of boot time, and it's annoying.
Yup. There's nothing there (set to win 10 default). This problem is insidious.