If you want to stop using encryption and permanently decrypt the contents of the .hc file: Mount the .hc file using the steps above.
You must know the password and have any keyfiles associated with the container. Step-by-Step: How to Decrypt (Mount) an .hc File how to decrypt hc file
VeraCrypt does not have a single "decrypt" button for file containers; instead, you must move the files out. If you want to stop using encryption and