Hello,

Please create a menu item with "Static Content" of Menu Type and this is content of demo

<div class="mega-menu-content">
<div class="row">
<div class="left_content static-content col">
<ul class="left_menu">
<li>
<h6><a href="#">TOP TRENDING</a></h6>
</li>
<li>
<h6><a href="#">BEST SELLER</a></h6>
</li>
<li>
<h6><a href="#">NEW ARRVALS</a></h6>
</li>
<li>
<h6><a href="#">ACCESSORIES</a></h6>
</li>
<li>
<h6><a href="#">SALE OFF</a></h6>
</li>
</ul>
</div>
<div class="col">
<ul class="sub-menu">
<li class="level1"><a href="javascript:void(0)"><span class="mega-menu-sub-title h6">Product Tyle</span></a> <span class="toggle-menu"> <a href="javascript:void(0)"><span class="icon-plus"></span></a> </span>
<ul class="sub-menu">
<li class="level2"><a href="{{store url=""}}simple-product.html?___store=br">Simple</a></li>
<li class="level2"><a href="{{store url=""}}hebes-wood-chair-pro.html">Configuable</a></li>
<li class="level2"><a href="{{store url=""}}hebes-galaxy-light.html?___store=br">Deal</a></li>
<li class="level2"><a href="{{store url=""}}downloadable-product.html?___store=br">Downloadable </a></li>
<li class="level2"><a href="{{store url=""}}custom-options.html">Custom Options</a></li>
<li class="level2"><a href="{{store url=""}}bundle-product.html">Bundle</a></li>
<li class="level2"><a href="{{store url=""}}grouped-product.html">Grouped</a></li>
</ul>
</li>
</ul>
</div>
<div class="col">
<ul class="sub-menu">
<li class="level1"><a href="javascript:void(0)"><span class="mega-menu-sub-title h6">Extra Gallery</span></a> <span class="toggle-menu"><a href="javascript:void(0)"><span class="icon-plus"></span></a> </span>
<ul class="sub-menu">
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html?___store=it">Gallery List</a></li>
<li class="level2"><a href="{{store url=""}}hebes-wood-chair.html?___store=jp">Single Slide</a></li>
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html?___store=fr">Vertical Thumbnail</a></li>
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html?___store=en">Horizontal Thumbnail</a></li>
<li class="level2"><a href="{{store url=""}}simple-product.html?___store=br">No Thumbnail</a></li>
<li class="level2"><a href="{{store url=""}}hebes-wood-chair.html?___store=ca">Multiple Slide</a></li>
</ul>
</li>
</ul>
</div>
<div class="col">
<ul class="sub-menu">
<li class="level1"><a href="javascript:void(0)"><span class="mega-menu-sub-title h6">Product Feature</span></a> <span class="toggle-menu"><a href="javascript:void(0)"><span class="icon-plus"></span></a> </span>
<ul class="sub-menu">
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html">With Video</a></li>
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html">Image 360deg</a></li>
<li class="level2"><a href="{{store url=""}}hebes-simple-chair.html?___store=fr">Light Box</a></li>
<li class="level2"><a href="{{store url=""}}simple-product.html?___store=br">Hover Zoom</a></li>
</ul>
</li>
</ul>
</div>
<div class="right_content static-content col">
<div class="marginalization">{{widget type="MGS\Promobanners\Block\Widget\Banner" banner_id="right_menu" template="banner.phtml"}}</div>
</div>
</div>
</div>