Why we cant choose the time we whant to play our home games?

Why there isent a alarm for ilegal formations, saying what is the problem with the formation, like the one that is for players out of position.

Should not be allowed someone play ilegal formations on CL, someone can manipulate the results that way, i had that problem this season, one guy played 3 games in ilegal formation, but against me changed it to legal (ROUND 3 and 4) and i be the Will play again a ilegal formation last ROUND, a level 9 manager knows what he is doing.