I’m presuming that it’s the same in the bookies. Say the game was Liverpool v Man U, and you backed Liverpool at 2.5 and staked your 500, you’d win 500 X 2.5, but if they drew, you’d get your 500 back.
Outside that bet, Liverpool to win the game will be better odds as a single bet, instead of 2.5, they may be 4.0 with the draw no bet removed.
Hope that helps