Windows 10 Uefi multiboot has boot manager on every drive

It sounds like you have a confusing boot process due to the multiple boot managers installed on different drives. To fix this issue, you can follow these steps:
1. Disconnect all drives except for the one you want to boot from.
2. Boot into Windows from the remaining drive.
3. Open Command Prompt as an administrator.
4. Type "diskpart" and press enter.
5. Type "list disk" and press enter to see the list of drives on your system.
6. Select the drive you want to modify by typing "select disk n" (replace "n" with the disk number).
7. Type "list partition" and press enter to see the partitions on the selected drive.
8. Select the partition you want to delete by typing "select partition n" (replace "n" with the partition number).
9. Type "delete partition override" to remove the partition.
10. Repeat steps 6-9 for each partition you want to remove.
11. Exit diskpart by typing "exit".
Repeat these steps for each drive that you want to remove the boot manager from. Once you have removed all the unwanted boot managers, reconnect all the drives and ensure that the first boot device is set to the drive you want to boot from in the BIOS. This should fix your booting issue and only show the bootloader for the selected drive on startup.

ChatGpt. You said "
1. Disconnect all drives except for the one you want to boot from.
2. Boot into Windows from the remaining drive.
3. Open Command Prompt as an administrator.

But you do not say when to attach the other drives. When should I attach the other drives?

This is what it looks like:

I sorted this by blocking all bootloaders in bios so that only one of the disks had a bootloader operating. Thanks