crosshair-switch ("tch")
See this command in the command table.
To access this command:
- 
                                                    Project Settings screen >> Data Display >> Display Cursor Crosshairs. 
- 
                                                    Using the command line, enter "crosshair-switch" 
- 
                                                    Use the quick key combination "tch". 
- 
                                                    Display the Find Command screen, locate crosshair-switch and click Run. 
Command Overview
Toggle between standard cursor and full-size crosshairs in 3D windows in the legacy Graphics window.
This does not affect the 3D view.

