The default font size for Lessons can be adjusted on the Lessons Tab:

Select Save to store your changes

When you preview a lesson you'll notice there are two font size options. Changing the base font size to a larger number will make all lessons in your workspace appear with bigger fonts. If you change the Bigger font size option, selecting the large A (in the image below) while in a Lesson, will reveal the effects of this change. 

Note: You can also revert back to the Coassemble default fond sizes by selecting Restore Defaults

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