You can configure pull request merge options on your enterprise to meet your workflow needs and preferences for managing Git history. For more information, see "Configuring pull request merges."
For information about the default commit messages for squash merges, see "About pull request merges."
- On your enterprise, navigate to the main page of the repository.
- Under your repository name, click Settings.
- Under "Merge button", optionally select Allow merge commits. This allows contributors to merge a pull request with a full history of commits.
- Under "Merge button", select Allow squash merging. This allows contributors to merge a pull request by squashing all commits into a single commit. The squash message automatically defaults to the title of the pull request if it contains more than one commit.
If you select more than one merge method, collaborators can choose which type of merge commit to use when they merge a pull request. If there is a protected branch rule in your repository that requires a linear commit history, you must allow squash merging, rebase merging, or both. For more information, see "About protected branches."