Build plate adhesion set to none or set skirt loops to zero, both should work, been a while since I used slicer.
I have given up trying to set skirt to zero. Nothing that I tried has worked and now I have learnt to live with it. ???
I use Cura 4.8.0 provided by AstroPrint. Under “Build Plate Adhesion”, “Skirt” is the default setting, with a line count of 1. I never found a Skirt to be helpful, so I select “None” now.