Font size for a Lesson can be changed within the Customise tab which will alter the size of the fonts across all Lesson modules. This is useful as it can be edited based on the demographic of participants in your course or for ease-of-access.
Navigate to the Customise tab and then proceed to the Fonts tab
Alter the Base and Bigger font size dependent on your requirement
Select Save to save your changes
Note: You can also revert back to the eCoach default fond sizes by selecting Restore Defaults