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

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

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.