I forked a public repo and made the new repo private.
I added a new remote branch on my private repo with some fixes committed.
Now, I want to create a pull request from the branch in my private repo towards the public repo I forked from.
I select the branch in my private repo and click "Pull request".
I click on "Change commits".
I can't change the organisation/repo owner. I only see my organisation, but not the one of the public repo. I could only create a pull request against master branch of my private repo, but that's not what I want.
Is it not possible to fix something of a public repo in a private one and create a pull request afterwards?
One solution would be to fork the original public repo into your own public repo on GitHub.
Then duplicate your forked public repo into a private one.
You then clone both on your local workstation, and: