How to turn off the following green infinite crosshair lines?
These infinite green crosshair lines or to use their correct name "alignment lines" can be turned off through the Sketching -> Grid Options selection:
With the Grid Options window open uncheck "Show alignment line":
This will then turn off the alignment lines:
For more information on Grid Options see the following Solid Edge Documentation:
https://docs.sw.siemens.com/en-US/product/246738425/doc/PL20200701135947994.sketching/html/pinpnt1d
Notes