Please excuse us, but we can not fully understand your issue.

If you want to hide one of the promo banner elements on the specific device, you can achieve this by using default Visual Composer options. See screenshot (https://gyazo.com/60701a8b0c5ecfc8a4761f468b940186).

If you want to show hidden menu bar only on mobile, but not on the tablet – add this code snippet to the Tablet Custom CSS area in Theme Settings.

.header-left-side .mobile-nav-icon {
	display: none;
}

Regards