If you go into the NVIDIA Control Panel, click on Desktop in the menu bar, then enable "Display GPU Activity Icon in Notification Area", does that show palemoon.exe? You can set palemoon.exe to use the NVIDIA gpu through the NVIDIA control panel, or you can use the built in Windows 10 route:
https://pureinfotech.com/set-gpu-app-windows-10/
I have palemoon.exe configured via both options and my Troubleshooting screen shows the same as yours. However, if I use GPU-Z or the GPU activity in Task Manager, they show the NVIDIA gpu is being utilized when watching a video on YouTube for example. Moonchild has said for some time that these gpu combos on laptops are tricky and can't be fullly supported, or something to that affect. My guess is this is a symptom of that. Or it may be the system's way of reflecting that all video signals are actually being delivered via the Intel gpu; these sytems hand off the video processing to the other gpu, then the signal/data is sent back to the Intel gpu to display on the screen.