Automatically setting an item's state upon pull request merge

Hi there,

I have setup a number of states in Azure Devops related to both development and QA.  When a pull request is approved and merged into main branch, is there a way I can specify which state the user story or bug is placed into?  I have a "Ready for QA" state that I would like it placed into.

The system appears to be doing this at the moment, but it always goes to a completed state.  I can't see any settings surrounding this.  Please help, thanks

Mark.