For some time now this feature has stopped working, before I was able to hover over the green audio source and use Alt+ Mouse scroll to zoom in and out making it much easier and quiicker for me. I think also shift+ scroll was able to make it bigger so I had a nice workflow of using both of these to quickly navigate the audio and enlarge it to see where the beat cuts.
For some time It has not been working now, I'm not sure if this is because of a new software update, I did also change my mouse but I went from 8 year old Razer Deathadder to MX Master 3s so I doubt that's the issue.
Now I've changed from windows to mac and I still have the problem