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Click on the heading (the line with Amount Per Serving), and move the vertical black lines until the red inner boxes are gone.
Use the purple side boxes to drag the label until the red inner boxes are gone.
Use the Zoom bar in the lower-left to resize the label for the screen as needed.
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When you click on any portion of the Label, you will have different modification options:
Header and Serving Size
Ingredient Options for Tabular Label, Using Calcium as an Example
Ingredient Options for a Tabular Label, using Green Tea as an Example
Ingredient Options for a Linear Label using Green Tea as an Example