To help locate hotspots on the screen, the cursor gravitates toward edges and nodes. The attraction of the cursor by elements is defined in pixels in the bottom section of the Options > Work Environment > Mouse Constraints & Methods dialog box.
Cursor Snap Range can be set between 1 and 9 pixels. 3-4 pixels is a comfortable setting, but at small zoom levels you may hit hotspots that you did not wish to snap to. If you have good pointing skills, use 1 pixel and you will not be forced to zoom in.
Cursor Snap Range will also help you to automatically snap to special points including the section points of existing lines or edges, perpendicular projections from the Edit Origin to existing lines or edges, and tangential points of the rubber band line along existing arcs, splines, curved edges, etc. The cursor’s shape informs you about the type of special point ArchiCAD has found.