Where a list/portal of records is displayed it is usual for the user to want to see the detail of a selected record. I prefer to see it to the side of the portal not in a popover. Until v17 and Master -Detail we have had to use a self-join or a script to achieve this. Master-Detail “works out of the box” no unnecessary scripts or relationship devices. Not so with portals built for related records. We still have to use program devices to show the record details for a selected record on the same form.
Please can Filemaker extend the M-D technique to all portals.