Front door will not stay open

Many designs are used to hold the front doors open. Typically, you have to take a look at it and see what needs tightening. Some need the pivot point tightened, some have a half round set of arms that pinch a round bolt and the arms need to be squeezed shut.

If it's a constant problem, some people will leave the arm, but add an external piston to the door to keep it open. If it's done right they look nice.