Online one line in preview

Dear guys, I made a wrong click and now I see the previews in my income folder only in one line (formally two and more lines)…

Is there an Idea how can go back?

Thanks a lot, greets, peter

Hello Peter. In Preferences (Mac version): “Mail” → “Read” → “Message preview” (choose 1, 2, or 3 lines).

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Thanks!!

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