You can currently only change some settings. Editing profile image, banner, or bio, is currently not possible.

Hey! Currently, profile editing is quite limited as others have mentioned. However, we’re adding more settings for profiles in an upcoming nightly version.

If you’re curious, this is the PR which adds display name, bio, and a whole bunch of other options: https://github.com/thunder-app/thunder/pull/1436

Not that I'm aware of unless it's been a really recent update.