I would turn off File Encryption if you never wanted it in the first place:
https://www.tenforums.com/tutorials/77174-decry...
https://www.tenforums.com/tutorials/97782-enabl...
I've seen a lot of lost files from Bitlocker being enabled without user's knowledge and it is disturbing. This is more limited but I'd still ensure that any files that are encrypted are decrypted before disabling it.
If in doubt of any step ask Shawn Brink in his tutorial Comments section as he is the master of his tutorial subjects.
I hope this helps.
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Note: Linked tutorial is from Shawn Brink who is a trusted Microsoft MVP.