In a workout, exercise editor, More Settings, Linked to Library.
Options
Unlink.
In a workout
The exercise was added from your Library and shares its history with that Library exercise. Photos and videos you add here also go on that Library exercise, unless it’s one of Pump’s originals. Unlink to make this one independent.
Shows when
Only in a workout, for an exercise added from the Library.
Good to know
Unlinking waits for the end-of-workout list like any other change.