Open the libraries folder. Or you can open another folder, such as the pictures, downloads, computer, etc. It doesn't matter which folder you begin on; all the Windows Explorer folders have the same method of enlarging the thumbnails.
Locate the taskbar near the top of the screen. On the upper right side of this, you'll see three icons. The first one on the left side, when rolled over with your cursor, should read "Change your view."
Click on the "Change your view" icon. A small menu will pop up with a list of different ways the Windows Explorer can present itself.
Select "Extra Large Icons". The icons will become large enough for you to see easily.
Repeat for all other Windows Explorer libraries.
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