This is probably because I don't understand something about how docker works, but I'm trying to get all the data from a container cleared. In this case the stack is for a jellyfin server.

I've tried removing the container and recreating it, I've tried removing the stack and recreating it, but no matter what I do as soon as I navigate to the jellyfin server in a browser all the accounts and metadata are still there!

All access is being done through Portainer, to delete a container I'm stopping it, then clicking remove:

To Delete a stack, I'm deleting any containers it has, then stopping it and deleting it: