Yamaha Motif ES8 How to set different track lengths in pattern mode

[grapher456]

So I'm a one-man band of sorts, I make up for not having band members with a loop station. Now with my boss rc300 I can set track lengths. That's really nice because it means I can spend multiple measures making a good sounding chord progression but only use like one or two for the percussion track allowing me to layer multiple drums quickly as apposed to waiting for the full chord progression to finish before adding another layer. I can't for the life of me figure out how to do this on my Motif piano. I can set the length of the loop, but that changes the length of all 16 tracks, I'd assume there's an option to change this but I can't figure it out.