Apple revealed a new previously unannounced feature called Lockdown Mode for iPhone, iPad, and Mac users
Lockdown Mode also provides protections from blocking attachments, link previews in certain messages,
Launch "Settings" on your Apple device; Then tap "Privacy & Security." Next, scroll down to the bottom and tap Lockdown Mode to turn the feature on. Read the related information about Lockdown Mode and then scroll down to tap "Turn On Lockdown Mode."