The Cloudflare data for each individual account is stored in the following location:

/home/[USERNAME]/.cpanel/datastore/cloudflare_data.yaml

You can either SSH into that specific user account and remove the data, or you can use the user’s file manager.

Once you remove the .yaml file all Cloudflare information will be wiped from the user’s account. This will NOT remove the domain from Cloudflare’s system, and should typically only be used when you’re running into specific issues with setting up a domain.