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Spend A day for reinstalling my macOS
Downgrade the system from the beta version to official version Big Sur

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You may find surprisingly that there will be a separate tab bar in Safari after updating to macOS Monterey beta 12.0
I like what it looks like in the last beta version
Then...How to roll back Safari

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Those troubles during the process of building an Code Server on my ECS
Solved or Solving

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