Take Windows7 as an example, turn on the computer, click the Start button in the lower left corner, and select "Control Panel".
Find "Appearance and Personalization" in Control Panel, and then select "Adjust Screen Resolution" below.
Select Enlarge or Reduce Text and Other Items in Change Display Appearance.
The default values are only 100% and 125%. If you want to make it bigger, click and select "Set Custom Text Size".
Adjust the percentage according to your own needs, then check "Use Windowsxp style" and click OK.