If you are wondering what Big Sur looks like before installing it, we have a peek right here.

With macOS 11 Big Sur, Apple takes the opportunity to refresh the Mac’s user interface. The changes aren’t dramatic—don’t worry, you’ll be able to use your Mac like usual. The changes give the Mac a more modern look, and also have led to  speculation that Apple is getting ready for the next phase of user input, like maybe a Mac touchscreen.

If you are wondering what Big Sur looks like before installing it, we have a peek right here. You can prepare yourself before you dive in.
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https://www.macworld.com/article/3566097/macos-big-sur-learn-about-the-user-interface-changes.html