On the Divi theme dropdown menu there is a down arrow. If you want to replace this with a + (or whatever) you can add the following CSS code into your ePanel or Divi Child theme. Use this list (the CSS column) to add your own icons into the menu.

#top-menu .menu-item-has-children > a:first-child::after, #et-secondary-nav .menu-item-has-children > a:first-child::after
{content:"\2020"; }

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