First, there must be room at the front bars of the track to allow lateral motion in either direction. So, if the audio is starting at the very beginning of the track, the track can only move to the right. Several ways to overcome this limitation and I think the easiest and way I use most often is to import the audio track a few bars into the song in anticipation of aligning with the other tracks.

With room to move taken care of

Ctrl-A to select the entire track
Hold down the control key and place your cursor onto the track and while holding the control key down, you can slide the track in either direction.

A tip to accurately align two tracks to each other is to place the cursor on the track you're moving to a point directly on the WAV form that you know the point on the track syncs to a point of the track you're syncing to and then use that reference to guide your slide movements.

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.