In Collector, it's already difficult to see which feature is selected as the highlighting is rather subtle. (See this item, for example: https://community.esri.com/message/535366 )
Compounding this problem is that when an item is selected and you tap "New" in a related table in order to collect a new record, the feature highlighting disappears entirely.
In this screenshot it's impossible to tell which feature was selected when a new record is being created. The highlighting which is there when you select the feature disappears as soon as you select "New" from the menu on the right, even though "New", by definition, has to be associated with a feature because that's how Collector is designed.
Can we keep the highlighting enabled on the feature associated with the new record?