Hello,
Sorry but there is no option in Theme Settings to make the header rows sticky for mobile and desktop separately.
You can try achieving this using the trick by enabling the header general to sticky by editing the header.
Screenshot for Clarification: https://gyazo.com/e670ed30b2637b03c1cb62b781a39425
And try adding the following Custom CSS in the Custom CSS for Desktop area under Theme Settings >> Custom CSS.
body .whb-sticked .whb-general-header {
display: none;
}
Best Regards