So you want the datasource on the right side of your page to refresh once the reference selector has been filled in?
If so, then you should refresh the context of the page (not visible in this screenshot) This should trigger the microflow to be refreshed.
You can do so by using an Onchange microflow on the desired reference selector.
Hi,
As Roy said, the DS Microflow will get triggered when the following events occur,
As per your requirement, in the onchange microflow, if your refresh your context of the page, your ds microflow will get triggered again