why does it generate 2 faces in a cylindrical surface?

[p2000]

hello to all, I have a curiosity to understand in the program, how come when I create a cylindrical entity (hole or plug x understand us) always generates 2 faces and not a single surface like the other programs?
If there's a way to have a single superfice?

 

[magic]

because I don't know, try the "costa" command.