Driving load (watts)

Hello.
I have been using Zwift for a week. I have a question. When the slope changes on the track (to 8%, for example), I would expect it to start turning harder (of course I would have to shift into a lighter gear), but that doesn’t happen. I rotate constantly with the same cadence / power regardless of whether it is a plane, a slope of 8% or a descent of -8%. I ask for your opinion.
I have Direto XR.

Are you using ANT+ and have you selected the FE-C as controllable device when pairing?

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Also check if in ERG mode (Constant Power mode) and if the slope slider under Settings (once in game) is not set all the way to the left (0 - zero).

Thanks Nicklas
Should be selected FE-C for power source, cadence and controllable ?

At least for the controllable. If you have an external power meter on the bike, you can choose if you want to take power/cadence from there or use the trainer. But it’s the “controllable” which is the important one when it comes to zwift controlling the resistance.