brickbuilder

Hello, I am using a dual extruder printer in which I don't want to have any retraction generated when switching between the two extruders. I have unchecked the "enable retraction" setting and in materials I have set the extrusion distance in my materials to 0. Despite this, retraction is generated when switching from one extruder to another. How can I eliminate this retraction between extruder switches? I am using Cura 3.6.