Windows 10 Pro – Secure Boot enabled Protects system from unauthorized software during startup
Windows 10 Pro – Secure Boot enabled Protects system from unauthorized software during startup
If you haven't disabled CSM yet, you might need to first save your changes and then restart into BIOS for the Secure Boot feature to appear. Before proceeding, make sure your drive is converted from MBR to GPT; otherwise, you won't be able to boot into Windows.
Both drives use GPT and display the GUID Partition Table. When you disable CSM support and restart, it seems to re-enable itself automatically. I've verified everything is compatible with secure boot, but it isn't visible. You can't enable it because it doesn't appear.