After you Personal Library.
View only iCloud Shared Photo Library content: Tap See photo and video information on iPad.
Deleted content; see at the top of the screen.
Tap Move to Personal Library.
The content in an iCloud Shared Photo Library is available to all participants, but the iCloud storage used to store the content counts against the library organizer’s storage space.
If the shared library content exceeds the organizer’s available storage space, the organizer can upgrade to iCloud+ or add additional storage to their existing iCloud+ subscription. See Add content to an iCloud Shared Photo Library on iPad