BB and Infinity looper. Song start

Hello everyone,
I would like to ask a question if someone of you can help me with a small problem that I cannot understand.
Normally I use my BB together with the Infinity looper, in some files the looper starts automatically at the first bar and in others only when I press the Infinity start button. I wish I could control this in my own way depending on the song. Do you know anything about this? Thank you for your cooperation.