We're trying to adapt as much of our company's CI into our Omniscope dashboards. It's working great so far except for devices. If there's an option to change font face, size and color for filter devices in the right sidebar or otherwise style them, I seem to have missed it.
You can colour one filter on the sidebar, either checkbox or slider type, by clicking on the colour button on that filter, but you cannot change the font.
Update: although there is no way to customise the Devices font independently from the whole application, you may wish to try changing the font under: Settings>File font