Hi there!

They're classified automatically, though I did make it so I can change the light/dark classification in the Admin tools if something is off.

Since the Similar Themes functionality was built, there has been work done on accessibility, tags, and the color profiles, so Similar may need to be revisited for its classification. I'll note to check that

Also, there is a Find My Theme link in the nav that asks a few visual preference questions, then shows themes related to the answers. If you have feedback about that, and what works/doesn't work well for you, I'd love to hear it!

Thanks!