I find using the Feature info widget while wrapped inside the Sidebar to be superior to the traditional pop-up on top of the map as a method to display feature attributes. However one of the big limitations in the Experience Builder version I have found is it can only display attributes from one feature. This then forces configuration of a separate feature info widget to display attributes for each layer, which will be very confusing for the user. The Sidebar Instant App has a very elegant implementation that drills down through all layers that have pop-ups enabled in the web map, and displays a header for each layer in the sidebar view. Please enable the Feature Info Widget to display attributes from multiple layers, similar to function in the Sidebar Instant App.