Zoom in (and out) into marked interval?

Assume I loaded an *.mp3 song.

Now I mark a certain interval/part from the fuill length.
Can I somehow zoom into this interval?

Can I (later after editing) zoom out the the full song back again?


View > Zoom to Selection - please see http://manual.audacityteam.org/o/man/zooming.html#horizontal .

In the case where you had imported the song, selected a region then done View > Zoom to Selection, yes - use View > Fit in Window.

But note that View > Zoom Out would not go back to the zoom level that fits the project in the window, but to some zoom level between “selection fitted to window” and “project fitted to the window”.