- Branches created in the web editor that don’t have a merged or closed pull request.
- Branches with an open pull request or merge request targeting your deployment branch.
- Branches pushed directly to GitHub, GitLab, or Bitbucket without an open pull request.
- Branches whose pull request has been merged or closed, including branches created in the web editor. A branch leaves the dropdown when its pull request is merged, even if the branch still exists in your repository.
- Branches with a pull request that targets a branch other than your deployment branch.
- Branches with a pull request opened from a fork. See Preview deployment not created for a fork branch for related fork limitations.