The point of interest manipulator lets you center the camera movements on an arbitrary point on the model. When you place the Point of Interest manipulator, subsequent camera moves are centered around that point.
Use the Point of Interest manipulator
Hold + (Windows) or + (Mac) to show the point of interest manipulator and do any of the following:
Hide the Point of Interest manipulator
The point of interest is now invisible, but still in effect.
The current point of interest is now locked. You cannot change the point of interest by dragging the manipulator or clicking geometry until you turn off the Locked option.
I can’t see or change the point of interest?
The point of interest feature may be turned off. To enable the point of interest: