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Font size in message list for the Office 365 webmail

After my Company switched to Office 365 yesterday, I've found that the font for the list of messages for the new Office 365 webmail is too big.

As you can see from the image below, you can barely see 3-4 messages without the need to scroll.

Is there a way to make that font smaller? I've searched all the options without success.

Thanks for your help.

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