Dear SZ9990,
Thank you for reaching out to the Microsoft Q&A Forum.
Thank you for sharing your feedback and for providing the screenshot. I understand your frustration completely. A small change in font size can make a big difference in readability and comfort, and it's disappointing when a design update makes things harder to read.
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Send your feedback to Microsoft is the most important step to get the default font size changed back for everyone. Your feedback is the most powerful tool for influencing these kinds of design decisions.
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