How to make the display of the office file wider?

I have it working but, it only uses about 1/3 the width of the screen.  I would like the file to fill the width of the screen.
It is a spreadsheet and is many columns wide.
Is that possible.?
I also can't find any instructions for the extension.  Where would they be located?  I've looked all over you menu options with finding instructions for any your extensions.

Marshall

Here is the link to the article on the website:
surfliner2024.org/clone/index.php/test1
Note: The window is full screen, but the spreadsheet is not the full width.
Is there something I need to do. Otherwise if not, I can't use this extension display the spreadsheet because it is unreadable.

Okay, I downloaded and installed the new version.  Still doesn't work!
I get a blank screen.
Marshall