that feature is the cash-out feature.
As far as I know, the Cashout feature is only used and obtained for sports betting, it is often encountered by those who like to bet on sports, especially football, because the Cashout feature can only be used before a match or in progress or something else called, namely in the form of Multi and Single bets, especially in football matches.
As an example of what I know about the Bets Cash Out option working.
In a match between, say, Real and Juventus, you bet $100 on Juventus winning, odds @ 2.50. So, your goal is to win a sum of $250. In the first part, the result was 0:1 in favor of Juventus.
The software offers the option to 'Cash Out' $180 and close your bet as a winner. At this point, you can accept the offer and win $80. No need to get further involved with the game.
Or, you can leave your bet open, to win the full amount ($250) if Juventus wins the match.
In the same game, if Real wins 1-0 in the first half, your chances of winning will be smaller.
The software can give you a $30 offer to cover your bet. This gives you the opportunity to not lose all your money ($100).
This means that the purpose of the Cash Out Feature is for those who don't want to risk losses and secure money if the match doesn't match expectations, but for me I rarely use this feature.