"Move/copy bodies" function greyed out

Hello forum, In an assembly, why and how to release the " Move / Copy bodies " function which is currently grayed out and therefore inaccessible.
Thank you for your help.
SW 2025

If it is indeed this function:
image
It only works in one room (multibody).

In an assembly, there are no bodies but parts or assemblies with constraints.
So to move it, copy, act on the constraints. Not with this function, which is normally grayed out since it is not available in an assembly.

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