How would I increase the font size on this feedback message on a quiz?

Hi,

You can easily change the feedback message font size by accessing the View tab > Feeback Layer > select the master feedback layout or specific feedback layers.
Then, select the text object > go to the Home tab or change the text size in the Text Inline Editor that pops up.

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Please refer to this tutorial to understand more about Feedback Master in ActivePresenter:

BR,
Thuy