If you're using OneDrive, you can access your SharePoint files in the mobile app without leaving OneDrive. (For Windows 8 or 8.1, open the folder you want to sort, tap More, and then tap sort by.) In the OneDrive app, open the folder you want to sort, then tap Sort.
If you are working in work or school account, a search always searches the entire OneDrive. To search all of your OneDrive files, use search in the Files view. For example, if a folder called Work Documents is open, search will look only at files in the Work Documents folder. If you're working in a OneDrive personal account, a search includes only the contents of the folder you have open.