I overcast the raw edges and wash and dry the fabric.
Sometimes that will make the fabric "relax" and it straightens itself.
The straight of grain is along the torn edge. If you don't want to wash the fabric to see what happens, you can try to pull it into alignment. Sometimes the fabric is processed so that one will have to live with it being wonky.
I will - very reluctantly - use fabric that is wonky if I can't get it straightened. But that causes me pain.