Hello. What are you trying to do? (I'm not sure why you would want to update a text display that no one can see.)
To answer your question, I thought of three possible solutions:
First, I *think* you can just uncheck "initially visible" in the text properties. You can still put text in the box, but it won't show up on the screen.
Second, you could change the opacity of the text box to 0%. (In other words, make it transparent.)
Third, you could change your font color to the same color as the background.