Hi, thanks. for reaching out.
MetaSlider handles its own responsive behavior, unfortunately, it isn’t something the theme is involved in. MetaSlider offers a possible solution here https://www.metaslider.com/faqs/the-responsive-slider-doesnt-quite-look-right-on-a-mobile-device/. You wouldn’t be able to use the page slider setting though. Ideally, you’re looking for a slider with mobile-specific settings.