You can apply the css codes below into your custom css to increase the size of these font icons,

[gist]
body #es .mod-es-menu-bar__icon-link > i {
font-size: 18px;
}
[/gist]

Where? Thanks

I add that code and now the icons dissapear.

Hey there,

I am really sorry for the delay of this reply as it is a weekend for us here.

It seems like those icon still appear on my side, you can check my attached screenshot below.

Perhaps you can try clear your browser cache and see how it goes.

Because it did show that icon bigger when i check on your site today.