Every other app treating the tablet like a mouse is the normal and desired behaviour. As others said, Wacom tablets on linux should just be plug and play. I literally just plug it in, open krita and start drawing. Big difference from the literally hours I spent on macOS trying to find the right drivers for this older model.

I would add that I did have some issues with the Flatpak version of Krita where the tablet didn't draw as expected. Replacing it with the standard deb from apt repositories fixed that though.

On Linux I didn't have to do anything other than plug in the Wacom tablet, launch Krita, and start drawing.

This page of the Krita manual has some troubleshooting suggestions specifically for Windows: https://docs.krita.org/fr/user_manual/drawing_tablets.html

Go in the system settings, there's usually a section dedicated to tablets.