If you have started your project through the template selector (as opposed to clicking the single Chart or Map button in your Library), you can have multiple pages in your project.
To add a page, deselect any charts or objects in your project or click outside the project canvas and click the “Add page” button in the right sidebar. There you will be able to select a blank canvas or one of the predefined pages.
Delete a page by either using the backspace button on your keyboard or by clicking the bin icon next to the page.
To reuse a page, duplicate it with the “duplicate” button.
Change the order by dragging and dropping them up and down the list.