[SOLVED]
If you want to change the filter in code.
you need to aim for the “Fild Key” name and NOT the “Fild Name”

This is because wix dataset columns have two names.
- The name you have given it “Fild Name”
- And a database name that wix will auto generate. “Fild Key”
This is how i change my dataset filter despending on if i am on mobile or not
if(wixWindow.formFactor === "Mobile"){
// Change slideshow image filter when on mobile
$w("#Dataset1").setFilter(wixData.filter().eq("mobileOnly", true));
}