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The XY projection is a front or beam view, which is the same as Action -> Reset.
Picking
The picking command is for selecting objects, displaying their attributes, and rotating around them.
Activate picking by selecting the Picking menu from the lefthand menu.
Now left click on a track.
The tracks HepRep attributes are displayed in the window. For instance, my selection is a gamma particle with energy of 0.36082 GeV.
Notice that if you select Translate to the Picked Object from the Picking menu and rotate the picture, the rotation will occur around the picked object rather than the center of the image.