With a BIOS in the modern UEFI mode, the drives themselves are not what's booted anymore, instead it boots the so-called bootloader that's on the drive. For Windows that's called the "Windows Boot Manager" and it's further down on the boot order screen, in a submenu "UEFI HDD BBS Priorities":
But you never really change the boot order manually here anymore. With an UEFI BIOS, the Windows installer can add itself here during the installation. BTW, it's important to only have the one drive hooked up that you plan to install it to. Because when you have several drives hooked up already, sometimes the Windows installer can get confused and put the bootloader (Windows Boot Manager) on one drive, and the actual Windows files on the other drive. So what you'd do is, press F11 for the boot menu to boot from a USB stick that was prepared with the latest Win10/11 Media Creation Tool, as mentioned in step 3)
here.
If you want to use an existing Windows from the SSD which came out of an older system, and that system's BIOS was not in UEFI mode yet, then Windows will not want to boot anymore at first, and you have to do a quick MBR to GPT conversion for the boot drive as explained
here. There's several guides on how to do that conversion, pick one you can understand and that doesn't use paid software to achieve it. Don't just use CSM/Legacy mode for the BIOS, that will only cause problems later on (for Win11, UEFI is a must).
Before any of that, i would update the BIOS to 7E26v1G or the latest beta from
https://www.msi.com/Motherboard/B650-GAMING-PLUS-WIFI/support
