Part of macOS
findmy…Find My
○ Leave it
Keeps your Mac findable with Find My.
What it is
Lets you locate the Mac and helps find your other devices and AirTags.
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
findmy…FindMy…searchparty…
… means any name that starts this way.
From Procession’s guide, in the words the app shows.