I don't think there is a way to do what you requested. You could delete %localappdata%/plutonium though which will wipe everything (sadly including classes) and start you from fresh again. Should clear whatever setting was changed.
Find them here and go to their profile.
https://forum.plutonium.pw/users
Follow this
https://forum.plutonium.pw/topic/559/how-to-add-friends-on-plutonium
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