Ordering in categories is slightly different from reordering in subcategories.
To reorder a page &/or subcategory, first ensure the object is "pinned" (click on the kebab menu next to item and choose "pin to category"). Once the page or subcategory is pinned, you'll see a drag handle (9 dots) appear next to the item in the list. Click and drag the item into the desired order.
Filtering and Sorting
You can filter your pages by name (alphabetically) or by last modified date. Just click "Name" or "Last Modified" below the category name.
Once you're finished with the filter view, you can either click "clear sort" or navigate away from the page.
Please Note: there is no way to retain these filtered views permanently. They cannot be used to set the order of subcategories and pages within a category.