A door assembly configured to be mounted in an opening and configured to control movement of persons through the opening. The door assembly includes a door within pivoting first and second panels. A lever is mounted to the second panel and is movable between a first lateral position with an end extending outward from the inner edge of the second panel and a second lateral position that is laterally offset from the first lateral position. A plunger is mounted to the second panel and is movable between a first vertical position with the plunger end disengaged from the opening and a second lateral position with the plunger end extending outward from the second panel and engaged with the opening. A gear assembly is configured to move the plunger to the first vertical position when the lever is in the first horizontal position and to move the plunger to the second vertical position when the lever is in the second horizontal position.

In example implementations, a vertical stacking door includes an end cap that is coupled to a panel. The end cap includes a body portion, a cam lever to rotate around an axis to generate a lift force to lift and separate an adjacent panel of a plurality of panels of the vertical stacking door, a first track wheel, a second track wheel, and a third track wheel.

Folding door systems, methods and devices includes a first door panel, a second door panel, and an astragal mounted to the first panel. A concealed hinge block is embedded within the astragal and provides a vertically adjustable base for a pin knuckle that couples to a receiver knuckle on the second panel. An integrated shoot bolt actuator system that drives bolts into a header and sill to secure the panels in a closed position operates around the hinge block. A worm gear-based adjuster mechanism within a receiver knuckle enables fine alignment between the two door panels in relation to the hinge knuckle. The system conceals all fasteners and actuator components within the astragal, supporting both inswing and outswing configurations. The modular architecture improves field adjustability, enhances aesthetics, and maintains compatibility with standard door panel constructions while enabling the panels to fold fully open against one another for maximum clear opening.