Use the page break block to separate your content into a multiple-page experience and add pagination, or page breaks, to a page or post. This can be useful if you are writing a step-by-step tutorial or if you’d like to split your page into multiple chapters, for instance.
In order to add a page break block, click on the Block Inserter icon.
You can also type /page-break and hit enter in a new paragraph block to add one quickly.