Magnifier enlarges different parts of the screen and is part of the Ease of Access Centre in Windows.
To open it quickly, click Start, and then type Magnifier.
then choose the Magnifier tool
On the Views menu, click the mode that you want to use.
I prefer Full-screen mode. In Full-screen mode, your entire screen is magnified. The Magnifier displays the area around the mouse pointer in the Magnifier window.
To change the zoom level, use the + and - icons. You can zoom up to 300% which makes the code blocks about 10cm high on the screen in my class.
To exit Magnifier, press the Windows logo key +Esc or use the red X in the top right corner of the control window.
To change settings while you are working, click on the magnifier in the task bar to show the control window again.
If you want to have Magnifier at your fingertips, you can pin it to the task bar.