GPUs not recognized - RX 580 & Nvidia 3070

I downloaded the default ISO hive image & created boot disk

booted fine - but NO GPU displayed
[gpu power lights are on - but fans are not running]

I have RX 580 & Nvidia 3070 on motherboard (using BTC-37 8 gpu motherboard)

Is there any BIOS settings?
Is there any GPU drivers to be added to image?

Please advice.