This is an overhead view of a Gantry for our tunnel boring machine as a drawing. When a mouse is hovering over a certain location, an orange highlight of the line is shown. There are plenty features missing from this drawing, but nothing is missing from the actual model.
So far we have tried:
1. Rebuilding the actual gantry.
2. Went to View and unchecked "Hide All Types"
3. Options -> System Options -> Change color of "Sketch, Inactive"
4. Changed from "Draft Quality" to "High Quality"
The entire Gantry is a part, not an assembly.
Let me know if there are any questions.