CA SYSVIEW for DB2 User Profile option 'Mixed Case CORRID-Wrkstn Qual' does not make any difference anymore, it seems both N and Y settings now have the same results.
For example in 'R/HTLIST Thread History List' panel with options Y and N, there was not any difference in the the displayed results in the 'Correlation' column, all values were displayed without any filter.
Release : 20.0
Component : CA SYSVIEW Performance Management Option for DB2 for z/OS
The 'Mixed Case CORRID-Wrkstn Qual' profile option is used for correlation ID/end user workstation qualification fields on FOCUS screen, not for UI column filtering.
For example if you set above profile option to YES and provide a mixed case qualification as shown in below screenshot, It stays as is.