How to change page size and template

1. Open a note
2. Tap the three-dot button at top-right of the screen
3. Tap Change Template
4. You may select from a built-in template, or uploading your own custom template. You may also change the page size by tapping the page size button.
   
5. After selecting your desired page size and template, you may choose to Apply to current page  or Apply to all pages

Note that custom template is only supported for Notewise Unlimited and Notewise Cloud users.