Create your windows USB disk Enable F12 in BIOS then reboot with F12 or Fn F12.
You can't change to Legacy boot mode with most modern computers and you won't need it here. What specifically are you trying to do? Your XC-895 likely has an NVMe SSD mounted in the M.2 slot, not a HDD.
Note that the USB will have to be bookable as WIN CREATE USB TOOL will do.
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