`devcommands`, then `env clear` (or any env of your choosing). At least that is if the mist is weather, I haven't hit mistlands yet (restarted from scratch).

Originally posted by MajorAssman:

there is a mod for it

Have a link? I can't find one.

Improve wisplight clearing[valheim.thunderstore.io]

Remove all mist[valheim.thunderstore.io]

there is a mod for it