Abandoned pull request in Azure DevOps is still active, how to remove it from "Active" view?

I created a pull request in Azure DevOps but found out it needed to be cancelled so I abandoned it. But it is still in the "Active" section (and "Abandoned" section). I want it to only stay in the "Abandoned" section and couldn't find a solution for it. For GitLab, we can just simply "Close" the pull request without merging the code. How to handle this in Azure DevOps? Thanks.