To stop the front wheel from swiveling, pull up and rotate the front wheel swivel lock counter-clockwise, into the locked position and rotate the front wheel to straighten it until you hear a click.
The front wheel must be locked in the forward facing position before running, jogging, or walking fast.
This needs to be checked before each use of the stroller.
Information about locking the front wheel can be found at minute 1:15 in video below.