When I click “turn on”, It will back to the second picture, and I click turn on community plugins, then it back to the first picture.
I don’t understand. What do you want to happen?
That’s how it works. Restricted Mode turns off the Community Plugins feature — that’s its whole function.
When you see the 2nd picture, that means “Restricted Mode” is - ON - 
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You might have network problems, DNS problems, or a firewall problem.
If you open the “Developer Tools” and “Console”, you might be able to see some errors.
More info here: Failed to load or browse community plugins
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