Hide Preview in Essentials Manager

I have a map service with several feature layers that must be on by default.  When the preview tries to draw all these features, it bogs down and asks me if I want to "Stop running this script?".  Since my map is already configured the way I want, this is OK, but it's annoying and takes a long time to draw.  I'd like to see the ability to toggle the map preview on and off.  After initial setup, it's not something a lot of us are particularly interested in.

Dave