Hi. Nine races into my season on PC I seem to have lost the ability to change mix during the race. The only options are tyres and brakes. The car is fuelled full in the garage too in practice and all qualifying. I used to see 10 laps or 5 and the chance to go lean etc in the setup screen. This option is just greyed out and the tank is full. Is this something ive done or a corrupt file? Appreciate any feedback thanks.