Precision Farming - Adding Nitrogen page?

[Traktorjonas]

Hello there, So from standard made there is only 11 visual states in the nitrogen page in menu ingame - I have added many more cause i like it realistic - So i have now 33, but it can only show 14, How do it make another page or two so i can see them all? Like it does when a map have more fruits than can be showed in one page....

Picture shows its going up to 140 - But i want it to go to 320 Kg N.