Turn off GPU for Fusion in Resolve 15.1

Does anyone know where the toggle is to turn off GPU processing for Fusion in Resolve 15.1? The manual says it's in the system panel of the preferences window, but its not there on my Windows install.
Thanks
DC

I need that function too because if i run fusion on GPU some render are bad (flicker, missing frame, duplicate frame...).
I have to downgrade to 15.0 because of this missing function in 15.1

viewtopic.php?f=21&t=79539

Still haven’t heard from BMD yet, whether we ever will is up for debate

Cheers,
Mike

Ah - thanks. Didn't spot that post. I think BM are in the process of knitting together Fusion with Resolve's GPU engine, so maybe just turning it off for Fusion isn't a thing now. Or maybe it just got forgotten from the interface
DC