How to change the count-in length of the metronome in Mainstage

Hello,

I want to use Mainstage for a live performance. In some songs, I want to use the playback instrument, and the band should begin playing at the same time with the playback. I therefore must use the count-in function. My question is - can I adjust the amount of bars/beats of the count-in before it begins? I couldn't find it anywhere.

Thank you!