So I would like you guys to remind me again, what does free hit do again?

iirc I get to swap as many players as I want to with free hit right? but after the round ends, it will goes back to my original players? I have like 7 out of 11 lineup players that wont play on the next round though so probably this is going to be a good time for me to use the free hit isnt it?

Damn all these next fixtures getting postponed are really going to cost me I guess