Changing loop length on loopback within a patch

Hi everyone,

I just started getting into mainstage and am exploring loopback. I have loopback working in my set and its working fine. But, in one patch I would like to change the length, but for some reason it won't let me. Any ideas? I have loopback set to sync on, snap to bar, and play from loop start, no groups asigned. Thanks in advance