Header: When "Text Margin" is increased, it expands the box outside of the Page Margin.

2.1.0

I want to use the header function to add a large number in the top RH corner to designate that composition's order in the band book.

The size is 28 and the font is Musejazz.

I do not want the number crowded by the box I have invoked around it. However, when I increase the "Text Margin" acceptably the box expands outside of the printable range, as noted above.

I cannot find a way to move the header position to counteract this.