Hi !
Today I have discover that I canāt show for who is shared a Folder when Iām not the owner.
For example: User A create a folder and share it to user B and C.
So User B canāt know that folder is also shared with user C.
And obviously, user C canāt know the folder is also shared to user B 
I donāt have find a setting to allow users to show shares appliancesā¦
it is possible to allow my user B to know his credit card are also shared to my user C ? 
No. In most cases it would be a challenge that B knows of C and the other way around. Imagine you share with two customers or two suppliers, etc.
If things are secret, you should stay in control of sharing which you can only do with folders you own.
This make sense, but imagine Iām a project leader.
If I share documents to my team, I can restrict the re-shared option to control who have acces to my customers documents.
But in case of a team member share to me a new document from a customer, and the customer just allow this member and me to show the document.
I must be sure he doesnāt share the document to other team member.
Good point. Dropbox shows the names of other users the folder was shared with. I would like an option in the share dialog with āreveal list of users to all recipientsā or something like that.
For such basic question, we should probably involve the developers of this app as well:
@rullzer @bjoern @jospoortvliet