So,usually the first thing i do when i get a game is to check keybinds,and whats my suprise when i get a warning that i cant use the arrow keys for movement!

Im a left handed so thats what i use since i started playing pc games over 20 years ago,left hand on mouse and right hand on arrow and numpad keys,and until now,only Dead Space 1 from EA didnt allowed me to use the arrow keys (wich they never did anything about it actually),so please tell me,why can't i use the keys i want to play the game?