Word Document - Projector screen and Monitor Screen

Rather than reformatting Word documents to non-standard paper sizes, the recommended approach is to leverage Presentation Mode in Word or PowerPoint. These features enable documents to be displayed in full-screen view and automatically adjust to the resolution of projectors or monitors, ensuring that the original A4 layout remains intact. For multi-monitor and projector environments, Microsoft specifically recommends using Presenter View in PowerPoint or Present Online in Word, both of which provide a seamless and dynamic presentation experience without compromising document formatting.

How to Use Presentation Mode in Microsoft Word

Present on multiple monitors (and view speaker notes privately) - Microsoft Support