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On Windows, this is called Magnifier, and you can find it in Settings > Ease of Use > Magnifier
You can trigger it anytime by hitting the Windows key and plus(+) on your keyboard, then stop by hitting the Windows key and Escape.
On macOS, this feature is called Zoom, and you can find it in System Preferences > Accessibility > Zoom.
You can enable a keyboard shortcut or even a scroll gesture for zooming, then use it whenever you want. Move your mouse to see different regions of the screen, then zoom back out when you’ re done. I don’ t use this feature every day, but it comes in handy when I do. Keep it in mind.
Reduce contrast and transparency for a vintage look and increased performance
Modern desktop operating systems don’ t define edges with thick black lines. Instead, they use more aesthetically focused differentiators like drop shadows. It looks nice, but makes it hard for some people to tell where one window begins and another ends. All of that transparency also uses up system resources, which can be a drag on slower computers.