Text Box Characteristics

My issue is with text boxes changing the size of text when you click inside the box. This seems to be something that has been carried over from Powerpoint that I have never understood. Who would want to click into a text box to edit it and have it preview the text differently than what it really will show when I'm done editing? Example:

Notice that the line breaks in a different spot and the text looks bolder when not editing. In terms of typography, design, and layout this is a major annoyance. Does anyone know if there is some purpose to this feature of PPT/Storyline?

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