Allow adaptation of font in preview screen

In Studio 2017 the font on the preview screen cannot be enlarge more than 100%. For me, and many others who spend their days squinting at computer screens, our eyes are no-longer what they used to be and 100% is just not enough to be able to read, let alone perform decent proofreading -rendering this wonderful feature quite useless.

Would appreciate the option of enlarging to whatever size is necessary or at the very least to 200%.

Thanks.