visjs add on : disable physics after graph stabilization

I am rendering a network diagram with the visjs addon. I want to disable physics and just be fine with drag and drop once the graph stabilises. I don't want to disable physics all together because else the nodes appear on top of each other. Most of the discussions visjs indicate I need to use the setOptions()with networkdiagram after the graph stabilises to disable physics , but such a method does not seem to exist with the addon. 

would appreaciate any help here.