When you use either the new experience or classic view on the OneDrive for Business webpage, you discover that you can't customize the webpage. Additionally, you can't modify the fields or content types for the page or library.
To work around this issue, use one of the following methods:
If there are existing customizations to the webpage, switch to classic view. However, be aware that classic view will eventually be phased out. Additionally, new customizations to classic view aren't supported.
NOTE: To switch to classic view, click Return to classic OneDrive in the lower-left corner of the OneDrive for Business page. Additionally, an administrator can control the OneDrive for Business experience in the SharePoint admin center in the settings section by changing the OneDrive for Business experience setting to either Classic experience or New experience. If you're a global or SharePoint admin in your organization, and want all users to stay on the classic experience until you roll out the new experience, go to the classic SharePoint admin center, click settings in the left pane, and next to OneDrive for Business experience, select Classic experience.
If customizations are required, consider using a SharePoint Online Team Site. For more information, go to Using templates to create different kinds of SharePoint sites
This is the expected behavior. Customizations to the OneDrive for Business page or the OneDrive for Business library settings aren't supported. Some customization scenarios include the following:
Content type configuration
Modifying columns for the library
Changing versioning settings
Creating sub sites for the library
For more information about changes in the browser experience in OneDrive for Business, see the OneDrive Blog.
Still need help? Go to Microsoft Community.