Issues: No Export to CSV option present under actions

How to Use GitLab Self-managed
2

The screenshot looks like a group view, not a project view. Can you check whether the export works in a project view?

For group level exports, see the following discussions

  1. Export Issues to CSV at Group Level (or any level other than project level)
  2. Add "Export" to issues list at a group level (#2704) · Issues · GitLab.org / GitLab · GitLab