In the Map View Flight Info Panel, under Map Options at the bottom, you can adjust the Burn Gizmo Sensitivity for your maneuver nodes...
It can be adjusted between 0% - 100%
I really don't see the use of having the 0% option, I suggest it should be adjustable between 1% - 100%
I very often use the 1% setting for sensitive adjustments, and it would be nice to simply slide the blue dot all the way to the left in order to easily set the sensitivity to 1% instead of having to slide your fat finger back & forth on a very sensitive screen trying to get the adjustment just right.