Disable on mobile devices

I am unable to disable the header on mobile devices. I have set the “hide screen if narrower…” to various numbers and tested them out on my phone. From 2000 to -4000. I have it now at 600 px and the results don’t change.

If the pixels of the smart screens are reaching the same as macs and laptops, this feature won’t do justice. Please could you advise which is the best way to resolve this?

I would like to add a mobile friendly interface to the mobile devices instead. Thus I would like to remove the header from there.

Thanks in advance

https://www.ads-software.com/plugins/sticky-header/