Hi Cliff,
You can edit the styling in the "_navigationbar.scss" file. If you go into your theme folder > style > Sass > components you can find this file. I was able to accomplish what you wanted by editing the ".glyphicon" class.
This is the styling I added (i'm no css expert so I would play around with it to make sure its responsive enough for your app)
.glyphicon {
top: 1em;
vertical-align: middle;
font-size: $navtopbar-glyph-size;
display: block;
text-align: center;
}
Once you save that and compile it with Koala (or some other SASS compiler) your navigation should look like this
Just in case, here is some documentation on how to setup Koala
https://docs.mendix.com/howto/ux/setup-mendix-ui-framework-with-koala
Hope this helps!
That worked a treat, thanks for the help :-)