Hi there,
This is correct, changing the font size is not currently supported in Panda.
Panda is just the test version of the new Editor for Bear at the moment. For now, we’re just focusing on testing major new features in the Editor.
The team is working on a lot of things at the moment, therefore prioritisation is necessary. This feature is not within the current prioritises.
However, a workaround noted by this user might be beneficial, see here:
Hoping this helps! 
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