Build plate Adhesion Options

I have tried today to change my Adhesion options in Luban. (I am running v3.5.0 and trying to print on my snapmaker original). I click Customise, Adhesion, and I see my current setting is Skirt but the drop down is greyed out and will not allow me to select anything else. What am I doing wrong? Any advice gratefully received.

You have to make and save a custom profile.
Hope this helps!