In Track View, what is the waveform showing? It will either be one wave for mono or 2 waves for stereo.
You can only really pan mono signals. With stereo, the pan control acts like a balance control found on HiFi equipment.
Depending on how the (stereo) signal was recorded it may or may not pan at all.
In situations like this, drop a copy of Channel Tools, either in the Fx bin or as a chain in the Pro Channel.
You can then place any signal wherever you want in the stereo field