The system font size setting can be accessed in Windows Settings – Ease of Access – Make text bigger in Build 1809 of Windows 10 or newer operating systems. The desired system font size can be set with the slider under “Sample text”. Changes have to be applied with the Apply button. The font size set is actualized to both traditional Windows programs and Windows 10 apps.
After setting the appropriate font size, you can set selected font categories to bold with System Font Bold. Changes have to be applied with the Apply menu. New settings are applied after the next log-in.
If the system font size is big, the display of desktop icons may be problematic. You can also set the spacing between icons with System Font Bold.