Whenever I submit a pull request to a merge a feature branch into the master branch of my own github repository the default value is always the original repository that I forked (see attached screenshot). How do I change the default Base repository to mbigras/phase-0-tracks instead of Devbootcamp/phase-0-tracks? Thanks!
You could try the following:
Create the branch again locally with the same name and the same contents the branch you want to merge to, it has to push to that branch to recreate the remote branch; and then reopen the PR to the branch. For example, you have a PR to branch1, which is deleted. You now want to merge to master and retain comments on your existing PR.
git checkout master
git pull
git checkout -b branch1
git push
Reopen your PR to branch1.
When merged to branch1, merge to master.
来源：https://stackoverflow.com/questions/36973589/how-do-you-change-the-default-base-fork-for-a-github-pull-request