I am using an Ender 3 (v1.1.4) with Marlin 1.1.X bugfix installed. Also BLTouch v3.1 is used. The probe is deployed once only while mesh bed leveling. 

How can I make the probe deploy twice at every point? Where am I supposed to change the code for it?

Please explain in detail if possible as I am not familiar with the coding part?