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Thunderbird 78 Mac screen is huge

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I have an iMac running Catalina and Thunderbird 78. For some reason when I open my mail, the entire Thunderbird screen is HUGE. I have changed font, but that does nothing. How can I reduce the size of the whole screen?

I have an iMac running Catalina and Thunderbird 78. For some reason when I open my mail, the entire Thunderbird screen is HUGE. I have changed font, but that does nothing. How can I reduce the size of the whole screen?

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Does it look correct if you run in safe mode (hold Option when launching TB)?

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Help./Troubleshooting, about:profiles, create a new profile. Does it still open too large?