Can I change the five-page brochure to a3?

1, open photoshop software on the desktop.

2. Open the prepared poster.

3. Click the image at the top of the interface and click the image size in the pop-up menu.

4. Click the image at the top of the interface and click the image size in the pop-up menu.

5. Set the size to 420× 297mm, which is the standard size of a3 paper. Uncheck the constraint before, and then click OK.

6. After clicking OK, the image will become a3 size, and the image scale will change accordingly.