Throttle center 0 not working on Herelink

Hi.

When pushing the left stick down, it is neutral (0 throttle), center is full throttle. Up doesn’t do anything.

I have bi directional ESCs. and want down to be reverse, center to be neutral and up to be throttle. Does anyone know how I can change it? I don’t see any settings for it in QGroundControl.

Does it show full range in GCS? Is it possible it was the autopilot ignore those section of range?

What you show is the Herelink Settings App, not the GCS. It only tell us Herelink thinks its output is normal.
We need the GCS directly connected to autopilot (eg, Mission Planner/QGC connecting via USB) to check if autopilot is receiving full sbus range.