About merge methods on GitHubโ
You can allow contributors with push access to your repository to merge their pull requests on GitHub with different merge options or enforce a specific merge method for all of your repository's pull requests.
Configuring commit squashing for pull requestsโ
You can enforce, allow, or disable commit squashing for all pull request merges on GitHub in your repository.
Configuring commit rebasing for pull requestsโ
You can enforce, allow, or disable commit rebasing for all pull request merges on GitHub in your repository.
Managing the automatic deletion of branchesโ
You can have head branches automatically deleted after pull requests are merged in your repository.