How to find forks of a repository in Azure DevOps

Even when I find a fork in Azure devops by manually traversing the UI I cannot find a place to view where that repo was forked from.

You could use the REST API Forks - Get Fork Sync Requests to retrieve all requested fork sync operations on this repository:

GET https://dev.azure.com/{organization}/{project}/_apis/git/repositories/{repositoryNameOrId}/forkSyncRequests?api-version=6.0-preview.1

As the test result:

We could to know the repo ID where current repo was forked from.

And we could use the Repositories - List to know the name of the Repo:

Update:

In GitLab I am able to see who has forked my repository by clicking the link. Does anyone know if there is a similar capability within Azure DevOps?

If you want to know who forks your repo, you could just use your REST API

Forks - List:

GET https://dev.azure.com/{organization}/{project}/_apis/git/repositories/{repositoryNameOrId}/forks/{collectionId}?api-version=6.0-preview.1

And we could use the oraganiztion id for the collectionId. We could use following RETS API to get the oraganiztion id:

Post https://dev.azure.com/{organization1}/_apis/Contribution/HierarchyQuery?api-version=5.0-preview.1

Body:

{
    "contributionIds": ["ms.vss-features.my-organizations-data-provider"],
    "dataProviderContext":
        {
            "properties":{}
        }
}

The test result:

If you create a pull request for a repository that has been forked, its "into" options will include a select box that includes the list of forks from that repository.