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When Lockdown Mode is enabled on an iPhone, new Shared Album invitations are blocked. This feature is part of enhanced privacy and security controls intended to protect users from certain types of cyberattacks and unwanted intrusions. By preventing new invitations from being sent or received, Lockdown Mode adds a layer of security to the user’s photo-sharing experience, ensuring that users have control over who can access their albums and minimizing the risk of unauthorized sharing.

The other options don’t align with how Lockdown Mode actually functions. For example, Shared albums are not removed from the Photos library, as they still exist, but their sharing capabilities are restricted during Lockdown Mode. Additionally, the Photos app itself is not removed from the Home Screen, and users can still view existing Shared albums on their devices; they just can't invite new members or receive new invitations while in this secure mode.