Why is the sewing machine's presser foot not in the aisle?

There are many reasons for this phenomenon. Firstly, look at whether the height of the cloth feeder is appropriate, and secondly look at the height and pressure.
The method of adjusting the feeding spigot: turn the handwheel to the needle tip and the needle plate, then check whether the feeding spigot is level with the needle plate. If it is not flat, adjust one of the components on the front shaft under the machine head and loosen it with a screwdriver. Open the screw, adjust the height of the feeding teeth, and tighten the screw after adjustment.
Adjusting the pressure of the presser foot: Rotate the adjustment nut at the top of the presser foot lever by hand, turning it clockwise for greater pressure and counterclockwise for less pressure. The amount of pressure is just right.