If you would like to rearrange the order of your pages, you can go to Appearance>Menus and create a custom menu by:
- naming your menu
- selecting all of your pages and adding to the menu
- rearranging the order of your pages by dragging and dropping
- selecting the custom menu as the primary navigation and saving your settings
Tip: You can also add custom links and categories to the custom menu.
Disclaimer: the feature of creating a custom menu depends on a theme.