To delete all tracks in PlayIt Live:
Go to Manage > Tracks...
Click on the track list and press Control + A to select all tracks.
Press the Delete key and confirm the action.
Click the Apply button to apply your changes.
Note: If you have monitored folders configured (found in Manage > Monitored Folders...), tracks may be re-added automatically. To prevent this, either remove or disable any monitored folders before deleting tracks.