For a very brief time, Web AppBuilder would create a drop down list when you created a group of widgets in the header (see Link 1). In a recent update, they got rid of this functionality and made it so that the grouped tools are displayed all at once, one-on-top-of-the-other in the side bar (see Link 2). This new method of displaying grouped tools like bad on a computer, but it also renders the groups widgets essentially unusable on a mobile device (see Link 3). Please vote to bring back the original drop-down folder structure for the grouped widgets which was much more intuitive and pleasing to look at.
Link 1:
https://altamonte.maps.arcgis.com/sharing/rest/content/items/55c8984a889f45fbb2707e8d449c71c9/dataLink 2:
https://altamonte.maps.arcgis.com/sharing/rest/content/items/040a02d4bc61459d8e8a95a6d9ec1c5c/dataLink 3:
https://altamonte.maps.arcgis.com/sharing/rest/content/items/fbe171d177d04319bbcb1b0f20072705/data