Claas Dominator 108: Co oznaczają kolumny A, B, C na komputerze pokładowym?

hello everybody,
can some one explain to me from this image ( https://obrazki.elektroda.pl/3565985100_1375268185.jpg )
what are the A B and C columns showing, and image nr 1 from left, on my dominator i get error on that ,can someone tell me where it's located and maybe how to fix it?
thank you so much