Magic Trackpad 2 force touch settings Problem iMac!
This might need some triage to narrow what you've tried. Restart, new user, apply software updates. Before even that point, you should back up to Time Machine or your chosen backup method.


reset the NVRAM and SMC would rebuild the pre-boot hardware and software settings
restart the OS cures a temporary situation
installing new OS would rule in or rule out software issues


To expand on the initial triage steps above:

I would pair another trackpad (external) since that would tell me if your software or settings were causing this (some trackpads may not even do haptic, so I could see a check to see if the hardware had that and then the software draws what you see intentionally) in which case you would erase the Mac and reinstall the OS - verify the hardware shows haptic and restore your data and apps.

If it's not software, then hardware repair would be needed to see why your trackpad isn't being sensed as haptic since at that point you know your software is good.