Hello,
To make the mobile menu to slide from right side only on desktop then you need to add the following Custom CSS code in the Custom CSS for desktop area under Theme Settings >> Custom CSS.
.mobile-nav {
left: auto;
right: 0;
transform:translate3d(380px, 0, 0);
-webkit-transform:translate3d(380px, 0, 0);
-ms-transform:translate3d(380px, 0, 0);
-sand-transform:translate3d(380px, 0, 0);
}
.act-mobile-menu .mobile-nav {
transform:translate3d(0, 0, 0);
-webkit-transform:translate3d(0, 0, 0);
-ms-transform:translate3d(0, 0, 0);
-sand-transform:translate3d(0, 0, 0);
}
Best Regards.