Hello,
the "default.showLostCallsWhenFiltering" is an obsolete parameters that was removed in QM 1.5.1.
Starting from this version, when filtering by agent, lost calls were automatically shown only for outgoing calls. Inbound lost calls were not shown when filtering by a specific agent (because being not answered these calls are not associated to any agent).
The QueueMetrics 1.5.1 User Manual reports this key as obsolete and removed on 1.5.1 as you can see in the page 137.
Thank you and best regards,
Marco.