Word Document - Projector screen and Monitor Screen

Hi,  I am not sure if I can get any best recommendation here.

We have a document (usually converted into PDF) that the management used during meetings.  The presenter will show it on the big screen via projector in front of a big audience as well as on his wide in a small audience.

In the past, the document is using paper size A4.  I am not familiar with such projector and screen settings but according to the presenter, the screen (both projecter screen and on his wide screen), the visual does not fill up all the screen space.

The new presenter does not like it this way.  He wants us to find a solution to get the document "Stretch" or "Fill" up the entire screen (whether projector screen or any wide screen he uses).

A stupid idea is to use a custom paper size 16 inches by 9 inches in Word for it....but even that it does not ensure all projector screens and all monitor screens will fit.  Therefore this is not a dynamic solution, plus it will messes up all the formatting (example columnal layout width and table width etc) copied from the old A4 file.

Does anyone know a good solution for the above request?