Always show expanded menu (and hide menu pulldown button) on larger screens in Remobile Pro theme by StudioPress (regular 'mobile' menu continues to work in correct way). As seen on GenesisWP.guide at the time of writing.

responsive-menu.js

jQuery(function( $ ){

	// Enable responsive menu icon for mobile
	$(".nav-primary .genesis-nav-menu").addClass("responsive-menu").after('<div class="responsive-menu-icon"></div>');

	$(".responsive-menu-icon").click(function(){
		$(".nav-primary .genesis-nav-menu").slideToggle();
	});
	
	$(window).resize(function(){
		if(window.innerWidth > 799) {
			$("nav .sub-menu").removeAttr("style");
			$(".responsive-menu").removeAttr("style"); // Changed from default
			$(".responsive-menu > .menu-item").removeClass("menu-open");
		}
	});

	$(".responsive-menu > .menu-item").click(function(event){
		if (event.target !== this)
		return;
			$(this).find(".sub-menu:first").slideToggle(function() {
			$(this).parent().toggleClass("menu-open");
		});
	});

});

style.css

/* Responsive Menu
--------------------------------------------- */

.responsive-menu {
	display: block; /* Changed from default */
}

.responsive-menu-icon {
	cursor: pointer;
	display: none; /* Changed from default */
	text-align: center;
}

@media only screen and (max-width: 800px) {
	
	/* Other CSS rules */
	
	.responsive-menu-icon {
		display: inline-block;
	}
	
	/* Other CSS rules */
	
}