1. First, open the PPT in the computer and insert a picture. At this time, you will find that the view is still the default widescreen mode of PPT.

2. Click Design-Slide Size-Page Setup on the toolbar.

3. Next, in the pop-up options, select the slide size as A4 paper, and then select portrait. After the operation is correct, select OK.

4. At this time, you will find that your PPT view has become vertical A4 paper!

Now this PPT view is changed from horizontal version to vertical version.