Text box is breaking my lines prematurely

Hi.

I have built my concert in MainStage, and have all my channels and patches configured. I went to Layout, and added a text box and made it the width of the screen, with the patch list to the left. However, when I then go to Edit mode and paste or type text into the text box, it only allows me to type about halfway across the screen before forcing me onto a new line. I end up with all my lyrics limited to the left half of the text box, and nothing at all in the right half. This forces the words to be too small. Why can't i have a text line that goes all the way across the screen?

Thanks in advance for any help you have for me 🙂