Part of macOS
lockdownmodedLockdown Mode
○ Leave it
Applies Lockdown Mode’s extra protections.
What it is
Runs when Lockdown Mode is on, limiting features that attackers can misuse.
If you stop it
macOS starts it again straight away. Leave it.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
lockdownmoded
From Procession’s guide, in the words the app shows.