Sooo... is there any way to fully rename your project in UEFN?

I assume you can follow the “Duplicate A Level” part of this documentation page, I believe when duplicating it will ask for a new name but I’m not 100% sure

(post deleted by author)

I’m getting a “Batch rename” option, should I try that? Cause it doesn’t give me an option to Duplicate

Can I rename the level or will it break the project?

I would recommend trying to duplicate the island and fixing anything that needs redirection that didn’t move over correctly like cinematic sequences etc. I don’t think just renaming the level from windows explorer is a good idea