Welcome to Sweet Home 3D.
To get the visual effect of a pocket door, import an invisible box (with a checked Door or window option) to make a hole in the wall at the place of the door frame, then import a pocket door like this one (with an unchecked Door or window option otherwise you'll see the door part which is supposed to be hidden in the wall) and place it in the wall with unactivated magnetism.
And to invert the opening side of the door, you should read the FAQ.
----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
