From the menus, click Tools > Options. In the left pane, click Display > System. This version adds the new option Selection Proximity. This new option functions similarly to the Point Size option, also under Display > System. However, users working with clouds of points may change the Point Size, sometimes dramatically. This sometimes makes it difficult, if not impossible, to select elements.
The new Selection Proximity option lets you define the selection area. The selection area is the distance from the element that SURFCAM lets you click to select that element. Set Selection Proximity smaller than the distance between elements you need to select.