We use Xara Photo and Graphic designer for our labels and need to know how we can make the label go to the printer and print at a 90 degree angle for how it shows on the screen
I am not too sure I fully understand the question, but you have 2 options when you send to your printer:
In designer pro :
option 1. in designer pro:. go file =>page options and then choose page size. There you can set your desired format: portrait, landscape, hight width. when you are satisfied you can export as pdf and then just print as normal
option 2: set your printer settings to your desired size (try selecting advanced)