How do you make an A1 size poster in PowerPoint?

1. Open a new PowerPoint presentation with an A1 size template. You can find templates with the A1 size in the "Design" tab under "Page Setup."

2. Use the design tools and options in the ribbon at the top of the page to add text, images, shapes, and other elements to your poster.

3. Once you have finished designing your poster, you can print it out on A1 sized paper or save it as a PDF.