If Use as System Photo Library is grayed out, the current library is already set as your System Photo Library. Click the Use as System Photo Library button.Use the EZproxy service if you are using a public computer (hotel. Reserve study rooms, borrow and renew books, request Interlibrary Loan materials, use technology. Use the Chat Live/Contact Us button (lower right of each web page) if you need help with anything else Faculty support. After Photos opens the library, choose Photos > Preferences from the menu bar. available only from designated Library workstations within our physical libraries.Choose the library you want to designate as the System Photo Library.Hold down the Option key and open Photos. One of the photo libraries is already designated as YourLibraryName (System Photo Library).Additionally, all photos and videos from iCloud will redownload to the device. If you designate a new library as the System Photo Library and then turn on iCloud Photos, the photos and videos in the new library will merge with those already in your iCloud Photos.