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Jingli Hu 3Jingli Hu 3 

what permission is needed to see "sharing hierarchy" button (from summer 21 release)

There is a feaure, "See Record Access Reasons in Lightning Experience" from summer 21 release.  (Detail: https://help.salesforce.com/articleView?id=release-notes.rn_forcecom_sharing_view_record_access_lex.htm&type=5&release=232) we would like to confirm who can see this button and how to control the visibity?

Thanks,
VinayVinay (Salesforce Developers) 
This depends on the Hierarchical sharing and the sharing model (Private, Public Read Only, Public Read / Write, Public Read / Write / Transfer) you have in the org.

Reference:
https://help.salesforce.com/articleView?id=000326216&type=1&mode=1

Thanks,
Jingli Hu 3Jingli Hu 3
I understand how sharing works in salesforce. I am trying to know who can see "Sharing hierachy" button? is there a way to control who can see this button.