There is a parameter Is Visible to Customers for order statuses. It is set for each status of each type of order in
PBA Home> System> Settings> Order Processing> All Order Flows> select some order flow > select some Order Type > Order Statuses tab
However the option does not work - customers can see orders in all statuses in CCP even if 'Is Visible to Customers' is set to 'No' for these statuses.
'Is Visible to Customers' parameter is deprecated. There is a bug #PBA-54156 to remove this option from PBA interface.