You need to do three things (both are done from within BIOS Setup (Visual BIOS) and are done within tabs under Advanced - Devices):
1. Remove both SSDs from RAID0 array.
2. Disable M.2 Remapping.
3. Change boot mode from RAID to AHCI.
I am doing this from memory, via my phone, so can't detail it better than this (sorry). Hope this is good enough...