Hello,

I have double-checked the Advanced typography and I see you have set the colors: https://gyazo.com/2d5ba19cd1c0865fe0ccf893649405d8

I am checking the menu and see that the colors are applied correctly to this selector.

Next, you asked to change the color of these items: https://gyazo.com/42c1a8ed74187b4bd95d178affa02732

Though they are in mega menu, they are not menu items: https://gyazo.com/f86b5424d87385c766b81b0df7766552

I have provided the custom selector and custom CSS:

.widget_nav_menu ul li a {
   color:red;
}
.widget_nav_menu ul li a:hover {
   color:blue;
}

When I add this code, the color is changed properly: https://gyazo.com/0b3b3483502da3cb2941c1c885bc2d3b

Please add either the custom selector or code and set the colors as per your needs.

Best Regards