Yes, I needed that screenshot.
If you change the order of the layout and dataview (move the dataview outside from the layout frame and then move the layout into the dataview), then you will have the capability you are looking for. In this way the content part of dataview will be scrolleable and the footer part including save/cancel buttons will be kept on the screen. It is quite easy.
Hope it helps,
You can add a scrollbar to the Notes field by setting "Grow automatically” to No
Could you share a screenshot of the page in Mendix Studio Pro. I suppose you put the Dataview widget in Layout Grid. If you use a Dataview as root element of the pop-up page, then the content of the Dataview will have a scrollbar as needed.
Is this what you mean? looks like it is a Dataview.