Maranatha

Go to Appearance > Customize > Additional CSS and paste in the following:

.mega-menu-header #maranatha-header-menu-inner {
    visibility: visible !important;
    height: auto !important;
    overflow: auto !important;
}

.mega-menu-header #maranatha-header-menu-inner {

visibility: visible !important;

height: auto !important;

overflow: auto !important;

}

Max Mega Menu Documentation