Hi there,
Changing font size, type, etc. is not available in Panda at the moment as Panda is just a test version of the new Editor for Bear.
You can amended the font size, type, etc. in current Bear, and this will be the same when Panda and Bear are merged.
As a workaround for the meantime, a user here on this forum posted this: How I set up Panda for writing: text size, text style, spacing, version history
Hoping this helps! 