The Page Builder (PB) allows you to create unique and amazing pages, exactly the way you want them! You can build (found) it on the appearance > Page Builder.
After you build the layout, you need to add the layout that you have build on the page/post. There is add template button on the top. It's under "Title" section.
Block is all content in the site, just drag some element to page template.
After that you can click "Save Template" button. You have to save it first, just then edit the content of the blocks. If not, you can't get The Page Builder you want.
P.S. Template is using for page in the site, copy the template id and paste it on page template form in page.
paste to your page >