I have created a city utilities map and uploaded it to 'my content' on AGOL. With the amount of information involved, even with scale visibility parameters associated with certain layers, the map has a tendency to lag when refreshing. I would like to create group layers for my map (water-associated info, sanitary sewer, storm, rural water, etc) and be able to click the entire group layer on/off if I want. This would greatly help the load speed of the map and increase usability for those seeking the map. What is the easiest way to accomplish this? (Note: I have built a WAB Dev app that enables a toggle on/off switch but our dept. doesn't have an outward facing server, so I can't upload the app yet, so I'm looking for a solution using AGOL-based tools, and I am using ArcMap 10.5.1). Any feedback on this would be greatly appreciated, thank you).