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I didn't get what "he was all business" means.

“I had the Reagan guy, and he didn’t seem sadistic or threatening,” said Ruth Marone, 18. “But he was all business. I didn’t get that Robin Hood vibe or anything like that.”
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Hi Job,

'All business' means 'serious', or 'only concerned with whatever business is to be transacted'. We often use the phrase about someone who is unwilling to joke or chat during a business discussion.

In your quotation, it seems to mean that Reagan was just normally occupied with whatever business he had with Ruth Marone; he was not strange about it.
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Thank you.