The key to load bearing wall cracks is to insure that there is no further movement. To do this you should fill in the crack and then over a period of 6 to 12 months check for reappearances or separation between the filling and the wall.
If there’s is additional movement then it would be advised that you call a specialist. It may be anything from a simple matter regarding the property or something as expensive as underpinning the foundation.
Remember, cracks frequently appear around windows and door frames which are places of inherent weakness.