<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=572534) </details> <!--IssueSummary end--> On https://gitlab.com/gitlab-org/gitlab/-/issues/537445, support will be added for mapping and reassigning from Placeholder-users to Service accounts using the API and CSV. This issue focuses on enabling reassignment through the UI. To facilitate this, we might need to add a new filter to the UserFinder class and the GraphQL Users. ### Proposal * (optional) add an additional (modal?) confirmation window as reassignment is automatic in this scenario, and cannot be cancelled * Filter placeholder user reassignment drop-down list for service accounts that belong to the same top-level group