Learn about a new method for quickly selecting broken or orphaned reference geometry.
Projected Geometry
Likely, you've had this happen at one time or another, you edit a feature higher up in the model tree and geometry from that feature had been projected into another sketch, and was now broken or orphaned. You had to go to those sketches and repair or delete the broken projections. Sometimes, the geometry you needed to access was difficult to locate.
Now, there is one-click selection for broken projected edges. Edit the sketch with the broken geometry, right-click the sketch browser node or in empty canvas space, and click Select broken projections and use the Delete key or replace the broken projections.
For more information about projected geometry see To Project Geometry into a 2D Sketch.