Work with ACES in the Fusion page. Understand and adjust the Managed View LUT to align with the Edit & Color page and manually specify color spaces where required.
Use Resolve Color Management to set up a linear workflow in Fusion. Understand and adjust the Managed View LUT, and manually specify color spaces in Fusion where required.
Use correct color management with Fusion in DaVinci Resolve by using a linear Workflow. Convert from color spaces like rec 709 or Log footage to linear gamma and back.