Audio Track Mixer missing effect controls

Hi! My audio track mixer has suddenly stopped showing the effect controls I need - when I  go to window >> show audio track mixer, it looks like the first image below, where it used to look like the second image. I am not sure what settings changed, but it totally neutered the capbility of the track mixer, because I can't figure out how to add effects to all clips anymore. 

Any insights on how to bring back the full capability would be amazing! Thank you!