The "Layers" feature allows for data sharing and displays within the application. If your department shares a border with another Geoteamz City customer and you have spoken to and set up a data-sharing relationship with them, this is the feature to access the enabling of that data sharing. 

In the image below you can see all of the different jursidiction's data that is currently enabled in the application. 

If I were to disable one of the jurisdiction's data you will see the map reflect this change below.

Now If I were to reenable one of those layers I will now see that neighboring jurisdiction's data again. 

Looking on a more granular level you can then go into your Home Jurisdiction by tapping anywhere into the box or the 3 emblems icon. From there you will then see all of the different icons enabled in the application from Incidents (911 calls) to Geotrack (Location Sharing), Hydrants and more. 

If you were to uncheck any of these icons that will also reflect in the application as well. By unchecking Geotrack I will no longer see other unit's location deals in the map view as I do above.