The font and font size used in ETS5 are oriented toward optimisation of the working area and menus as well as a maximised view of contents.
In ETS5, there is no separate setting for the font, colour and font size to be used to display ETS Menus or window contents (icons, line spacing; icons would not be scalable via the setting anyway). The Windows system configuration settings are used for this. The only option for enlarging the basic view of ETS for small screens is the option under the Windows monitor settings for adapting the general size of the display (100%, 125%, 150%, or custom).