Open Audacity full screen so as to maximise your work area.
Click and drag the bottom edge of the track to make the track height as big as possible.
To get an idea of the volume level, ensure that you look at the waveform, not the envelope.
Alternatively, try this plug-in https://forum.audacityteam.org/t/simple-plug-in-for-creating-partial-fades/16055/1
(User feedback is essential for developing plug-ins. There have been 193 downloads of this plug-in and feedback from only 2 users, so if you try it, please post your opinions/criticisms of the plug-in in that forum topic)