Output routing UR44C V3

Hello everyone,

I would like to carry out measurements with REW and the UR44C. But to do this I need to deactivate the feedback loop. After more than 4 hours of searching and trying, I can’t find a way to prevent the input signals on input 1 (microphone) and 3 (feedback loop cable) from being routed back to the main output. Can you please help me here?

dspMixFx looks like this screenshot on my Win11 laptop:

No one?