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Drag Instrument Graphically. provides a means to move instruments by dragging them within the graphical view. This is quite helpful when a user wishes to roughly place objects in the job relative to each other or objects with know positions. It can be quite helpful to use orthogonal views for this process as you can only drag objects in the plane of the graphical view. This operation can also be triggered from the instruments right-click menu.
There are many other ways to modify the position of an instrument. The instrument properties offers direct access to the instruments transform, and the Alignment tab is dedicated to instrument locate operations.
Relocate to Another Collection offers a convenient means to help organize the location of instruments within the SA Treebar.