Turn the Stage/Readout display on and off to show text readouts on the stage image.
 
When readouts are unchecked, text will not appear on the stage image, but will still appear in the final PDF stage prop list and layout.   /Readout display on and off to show text readouts on the stage image.

Tip: To manually insert text on the stage, you can also use the Quick Text Feature. Text inserted with the Quick Text will only be displayed on the stage image, and not the final pdf prop list and layout.

Quick Text Feature