Convert dual boot to single boot

I currently have a dual boot (separate drives) of Win 10 Pro and the Win 10 Insider. I'm considering dropping the Insider and only having my production Win 10 Pro. I had the Insider versions to test my recording studio software and hardware but that is no longer necessary (like it was when Win 10 was first introduced).

According to the listing in my (UEFI) BIOS, the first entry is "Windows Boot Manager" which is shown as being on the drive for Win 10 Pro.

I have EasyBCD and I deleted the Insider from the boot list but that didn't work. It wouldn't boot with just the one drive listed. I tried recovering the boot loader for that drive, with several command line commands and none of that worked. I had to restore a disc image. Thus I'm stuck at what to do, if I convert to just the Win 10 Pro installation. Is there something else I can do in EasyBCD to accomplish this? I don't want to do a clean install.

Thanks/Jack

Here they are. Disc 0 is the 10 Pro installation.
Disc 1 is the Insider installation.

fireberd said:

Just delete the top two entries.

"Just delete the top two entries."

I essentially did that, with EasyBCD, and it didn't work. I deleted all the boot entries except the one I wanted.

You haven't tried it in MSCONFIG yet.

You could also choose your default OS, then set the boot timeout to 0 (just in case you change your mind!)

bcdedit /timeout 0 in an elevated Command Prompt.

After restart, your default OS will boot instantly.

But, if you want to recover the drive space, that's another scenario.

Solved. The problem wasn't EasyBCD and how I was doing it (or I could do it as NavyLCDR suggests). The problem was the ASUS UEFI BIOS. I had to delete "Windows Boot Loader" from the boot list.