Hi. When you have a list with a lot of rows and have set the property for “open form” -> “open as” : ‘sub form inside field’ and you have a quite wide screen it will open the sub form to the right like a reading pane in an email client.
I like this layout option, however it would be great if you could add a background highlight colour to the list row that is opened so that you can easily keep your place. When you click from row to row the sub form updates with the field records as it does now, however move the highlight to the currently selected row. And then remove the highlight when the form is closed.
Eg: an example from the bookmarks app:

(Not asking for it to be bright yellow 😆 )
Use case for me is in a list of all phonecalls received in my app (hundreds) and needing to quickly review records. It can be easy to lose where you’re up to at the moment as you have to closely match form field content to list content to keep your place.
Hope that makes sense.