FYI, you can change the resolution and other video options from within the xanadu folder. Launch the xanadi_cfg.exe file to do so.

Wow, thank you. Exactly what I was looking for!

In the gog galaxy, you can go to the game page, click "more", go to "other", then click config.

Thank you for pointing out that it exists, because I was getting annoyed at the resolution after just the intro xD

Thank you.
I had an invisible cursor with the default resolution. Once I changed the resolution my cursor reappeared.