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Reduce interface font size

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I find the font size on most program interfaces to be too small, but I recently installed Thunderbird and the interface looks enormous, reducing the message display area to a small sliver. Is there a way to decrease the font on the interface?

I find the font size on most program interfaces to be too small, but I recently installed Thunderbird and the interface looks enormous, reducing the message display area to a small sliver. Is there a way to decrease the font on the interface?
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Chosen solution

Try View>Fontsize>Reduce font size.

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Chosen Solution

Try View>Fontsize>Reduce font size.

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Thank you, David - worked like a charm!