How do I reduce them? (My cat stood on my keyboard & when I tried to use the mouse it made them all tiny, then enormous. It became a kind of zoom in tool!)
Is it just the icons or the entire screen in general? I think your resolution might've changed by accident..
For windows 10: settings > system > display > advanced settings (scroll down a bit) > move slider to "recommended resolution"
For windows 7: control panel > search for screen resolution (search box in the top right corner) > set to recommended
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