Atlas is great Instant App template, but I have recommendations for Map Layer list:
1) Show options (transparency, swipe...) for each layer in Group Layer. Now it is for every layer in Group Layer together. I have for example map where layer display old maps from different years. Layers are sorted to group layers for each century. In atlas app it would by great to add group layers by add layer which user want and compere layers using swipe, transparency.
2) Don't display options which are not available, for example table for tile layer. I have Atlas with only tile layer and it is confusing for user to see grey button for each layer.
3) Add option to collapse all layer in list. In my app I have layers with long ugly legend and it is not user friendly to scroll down the legend, or collapse all layer manually.
