This question provides context: Windows 10 system font size change
In this question is a way to increase system font size by 25%. Also, in liked help I found "create a custom DPI scale".
Open Screen Resolution by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
Click Set custom text size (DPI) in the left pane.
Click the scale (ruler), drag the setting to whatever percentage size increase you want (100%-500%), and then click OK. (If you prefer, you can type a number between 100 and 500 in the box next to Scale to this percentage of normal size, and then click OK.)
On the Display screen, click Apply.
However, this is obsolete (Win 7), I am looking for a way to do this on Windows 10.