Warum ist das Layout auf dem Handy anders?

This is F12 mobile layout:


This is in mobile layout,can anyone tell me why the two layouts are not same?

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I can’t tell why but the first one is desktop layout.

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Yes what Jakke said.

In your top pic open side bar near bottom of side bar there is a toggle if you want to see mobile view.

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You can make desktop more consistent with mobile by using this setting:

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