How to work with Change Action at PowerBy CATIA V5

Dear Community,

I want to change an CATIA V5 Part within a ChangeAction. 3Dexperience is R2021x FD06, CATIA V5-6 R2020 SP2.0.

Part is released. CA is created; I'm signed in as Leader, and myself is assigend as owner and approver. Part is under proposed change as new revision.

If I promote the CA to "inWork" a new revision of CV5 part is created by CA. Now I open the part from CA widget or by search in 3DX at CATIA V5, new revision is open in CATIA V5.

What I miss is the function "work under" there is no "hard hat" at the bottom right, where I can select the CA.

Is there a Setting, a Variable or a License required to perform CA within PowerBy?

Thank you for your feedback. Thomas