Hide visibility of sublayers in the layer view.

[Sara_Fatimah]

I have a web map with a group layer and within that group layer I have 3 sublayers that have a min-max scaling established. The broad layer appears on the map when the user is zoomed all the way out. Similarly, a mid layer appears for a mid-level zoom and a fine layer for a fine(city/county) level zoom. See photo: 

When I use this web-map in my dashboard, these sub layers appear in the layer view and can confuse the user. See photo: 

I would like the functionality to hide the sub-layers from the dashboard layer list, so all the user sees is the main layer in the layer view and not the sublayers. This way they wont be able to toggle on and off those sub layers.

Thank you!