Hello So I have Installed Windows 11 on my internal SSD which I will use for Gaming due to kernel Level Anti cheats

And I have Installed Windows 10 for Personal Work on my external hdd As Win 10 is better for privacy and doesn't Snoop arounds as much as W11

I have successfully Installed both Os but here's the issue

Whenever I boot into Windows 10 it still boots from Windows 11 Boot files which I don't want I want these 2 to be Completely isolated from each other and boot independently

I tried to make My SSD offline from diskpart but it says : Virtual disk service error Disk attribute may not be changed on the current system disk or BIOS disk

I made a EFI Partition in HDD and copied The Boot files into it Registered external hdd in Bcdedit Disabled hibernation, fast startup

Still same issue what to do?