Objects within collections moved out by themselves?

Hi. I am trying to understand what happened with my file.
There are other people working on it to so might be it.

All my objects are outside the collections inside a big object group, but the collections are empty.
Do you know how to fix this ?

Thank you

Likely maybe someone accidentally removed them? Not sure.

You can select objects in the 3d viewport, and under Object>>Collections, add them back into specific collections.

just change the outliner display mode

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yes,I hate to be new …but as a self critic, i should explore more.