The tracks view

Tracks show a wave form. How to increase the height of the wave form shown??

Just click and drag down on the bottom of the waveform pane.

Or if you just work with a single track all time time either

  1. View > Track Size > Fit to Height

or for a more permanent solution

  1. Edit > Preferences > Tracks and check the top item Auto-fit track height to be on

Peter

You may be looking for vertical zoom …
https://manual.audacityteam.org/man/vertical_zooming.html#simple

Zooming does not change the volume, only the appearance of the waveform.
If you want to increase volume see … Amplify - Audacity Manual