Modern PCs have an external monitor in addition to the main one just to extend the area. This one, because of its placement especially in the semi-folded form, would unlikely to be used just like a normal display, because of their position and rotation relative to the user, that one sees in front of their eyes, so additional software measures would be needed to make use of that space efficiently to, say (making it up), keep app windows on the main area but move shortcuts, desktop items, widgets to the bottom area etc.