You are watching 12 seconds out of a show that’s at least a minute and 12 seconds long. To see the whole show, Control-F for the Full timeline. Drag-select a portion of the show to Select it and Control-E to zoom into that selection.Those two and Zoom out a little bit Control-3 are the only three zoom tools I use. I’m on a Mac and my keys are Command instead of Control, but I think that’s right.
The thickness of the blue waves is the volume of the show. The show in the illustration is low volume and it would be hard to edit that way. You can increase the volume of the show to maximum without distortion by selecting the whole show by clicking just right of the up arrow, and then Effect > Amplify > OK. Turn your speakers down before you do that.
Are you editing a copy of your show? You should be. Never edit original work. If you mess something up, you could flush all your work back to the original performance.