You can use the Content Folders to help organize the Pages in your Page Library. By selecting a Content Folder in the folder directory tree in the left pane of the Page List, you can display only those Pages you have placed within the folder instead of the entire alphabetical list (which is the default view of the Page List).
You can create a folder structure of Top Level Folders and then add multiple levels of child folders under the Top Level (or, parent) Folders in your Page Library. This folder structure displays in a pane to the left of the alphabetical list of Pages in Page List.
To work with the folder structure, you can click the plus sign (+) in front of the All Pages Top Level folder to display the folders under it and then click a specific Content Folder to display the Pages associated with it in the Page List. Note that Pages will always display in the All Pages view regardless of the Content Folder with which you associate them.