Hello,

Please try to use the below custom CSS code and paste it to Theme Settings >> Custom CSS >> Global CSS section:

.page-id-8879 .wd-sticky-nav-enabled {
    --wd-sticky-nav-w: 0 !important;
}
.page-id-8879 .wd-sticky-nav.wd-hide-md {
    display: none;
}

Best Regards.