Lost Paper Space

A coworker of mine is new to AutoCAD and some how lost Paper Space in his drawing. When I click on the tab for paper space it looks just like Model Space. Is there a way to get Paper Space back?

Figured it out. I clicked on Maximise Viewport icon down along the bottom of my drawing window. This put a red border around everything. I then clicked ont he icon a second time and then zoomed out and found my title block and border.

I have no idea how my coworker lost his paper space. He said all he was doing was turning layers on and off in Model Space.

This happens to n00bs a lot when the viewport is not locked and they start zooming/panning... I call it "lost in paper space". A few years back I had this co-worker who would dot it all the time, so I put this function in her ACADDOC.lsp:

(defun c:LIPS ()
 (command "_.pspace")
 (command "_.zoom" "_e")
 (princ)
)

Then when she would ask for help I would just type it and she would be like "WTH..."

Thank you. I suspected he was doing stuff with the viewport active. I've warned him many times about this but I don't think he remembers to deactivate and lock the viewport when he's done.