I can only see “total” volume, not volume of each instrument.
Anyway, some parts are too soft, some parts are too aloud.
And I can “fix” this using envelope.
Is there a better, one click way of doing “the same thing”.
Is there a way to read the exact time of the vertical cursor?
You can read exact times from the “Selection Toolbar” Selection Toolbar - Audacity Manual
Probably not. How could a computer know what level you want?