Can't get a "full" page

All of a sudden my "full page" has gone away. I've stretched the page, I use the max button but even after doing that it still comes back with just a half page. I've restarted, ran clean-ups etc.

Is there something else I can do?

I have no idea why it suddenly stopped, never had this problem before.

Thanks for any help.

 

This is not clear.
Do you mean the page is not filling the screen?
Have you adjusted your monitor?
Have you checked that the display driver is installed?