block menu on tablets landscape view

Hi,

The version of the theme you are running is very old, I would recommend that you upgrade to the latest version which is 4.2: http://kriesi.at/documentation/enfold/updating-your-theme-files/

After that you can use this in Quick CSS:

@media only screen and (max-width: 1024px) {
  nav.main_menu {
    display: block !important;
  }
  #avia-menu .menu-item {
    display: none;
  }
  .av-burger-menu-main.menu-item-avia-special {
    display: block;
  }
}

Best regards,
Rikard