Track Pan
Each track has its own pan.  Adjust the pan control by clicking down on it and moving the mouse up or down.  You can adjust the pan from 100% Left to 100% Right.

Each Pan control starts in the Center position which means that the sound is balanced equally between the left and right channel or speakers.

- Pan control in the Center position

- Pan control panned partially to the left channel.

- Pan control panned partially to the right channel.

Alternatively, you can set the track pan by selecting the menu Track followed by Set Pan followed by a value or Set Exact Value...  You can also right click on a track to get the same menu options.