Right-click on the scrollbar in the front panel and select Horizontal Scrollbar -> Always Off. The same goes to the vertical one. I have saved the VI after such changes, closed it, opened it and it has no scrollbars visible.
While evaluating my code please have in mind that I am a LV novice. Therefore sometimes my code might violate some coding rules that I have to learn about myself. But how else could I do that... 🙂