Double-clicking on the audio clip track will open the larger waveform in the preview window, where keyframes can be added to adjust volume.
But having the timeline waveform track the amplitude would be welcomed. Suggest it by right-clicking the chevron at the top-right of the VP window.
There is a little trick you might try...
Right-click the clip audio track and, if available EDIT WITH WAVEPAD. Make adjustments there, then click the top-right X to close and OK the prompts. The change in gain will be reflected on the VP timeline waveform.