Lucid's Global Settings are located in the Lucid menu that gets added to the top menu bar (after Help). You can check it up, but I doubt it will help a lot; if there is a working CUDA driver Lucid should pick it up automatically. Maybe there is indeed some driver problem.
Ivan Kolev (Software Developer, EPHERE Inc.)
E-mail: ivan.kolev at ephere dot com
Discord: ikolev