You can pin pages to the top of a category in two ways: from the page list or within the page.
• Pinned pages can also be dragged to rearrange them.
• Pins will be ignored for pages that are custom sorted.
Navigate to a page and click the kebab menu on the upper right side. Select Pin to category.
The page will then show up at the top of the category with a pushpin icon right next to it.
Pinned status of pages will be lost if you change the sort order to custom. When you change the sort order back to alphabetical or last modified, you'll need to pin the pages again.