Welcome to Windows Central,
In your Windows 10 PC, go to Start > Settings > System (Display, notifications, apps, power) > Display. You should see a slider underneath the "customize your display" window. Adjust that slider towards the right and click on "Apply" at the bottom of the page. You should then notice a increase in overall font size in "everything" - you may be required to sign out and sign in again for the effects to fully take effect.
Should you wish to ask further questions, please don't hesitate to create a Windows Central account and respond in this thread.