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How to modify the default global zoom level of Thunderbird message content?

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How to modify the default global zoom level of Thunderbird message content? At present, you can only use Ctrl +, - to adjust. After restarting, it will fail. How can I change the default global zoom level?

How to modify the default global zoom level of Thunderbird message content? At present, you can only use Ctrl +, - to adjust. After restarting, it will fail. How can I change the default global zoom level?

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Edit/Preferences/Display/Formatting, Advanced... set the Sizes and fonts with Fonts for: Latin and repeat with Fonts for: Other Writing Systems, uncheck 'Allow messages to use other fonts'.