I've just received my Canon R5 and cannot figure out how to configure the CFexpress card to store Raw and the SD card for JPG's? It keeps storing them together and I can't understand the printed manual or the expanded PDF manual?

I have a 128Gb CFexpress B card and a 64Gb SD card. I would like the RAWs on the CFexpress card and the JPG's on the SD card. A step by step would be nice!