Creating New Openings

There is a Vinyl Window Company called Atrium Windows & Doors. But the term “Atrium” has also come to describe a door-configuration commonly consisting of a set of doors wherein only one of the two doors is operable. Usually the operable door is hinged off of the non-operable door, as shown in the second photo here, but sometimes the operable door is hinged off of the opposite jamb-leg.

One of the advantages of an atrium door-configuration is that you have the additional view & light afforded a double-entry configuration without some of the liabilities of a double-entry.
As most folks can probably understand, locking one door into another operable door panel is less than optimum when it comes to security, or even the best weather-stripping seal.