Flexible Hierarchy permission - Please explain how this works when setting up the roles in Role Management against products

When you create a new role, You can apply permissions to all of your products under the same role. 

You do this by navigating through each product one by one and applying the necessary permissions for each product for this particular role. 

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The last product you save permissions for, will be the default view of this role.  

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Therefore to view the permissions assigned to a role, you need to view the role and navigate through each product one by one.