I've added the ability to search 3 layers in my map in Portal. When I attempt to search those layers in Collector, however, I only get results from the first layer in the list. The documentation Configure feature search—ArcGIS Online Help | ArcGIS says that the user clicks an arrow to change the layer to search (as this is how it appears in Windows), but inside the app, there is no arrow and search is only possible on the first layer. Samsung Galaxy Tab S 10.5, Collector 10.3.3, Portal 10.3.1.