The QMF actions (SELECT etc..) are not displayed in the Thread History panel. However, such actions were displayed appropriately in the Thread History panel in R19.0. Why?
Release : 20.0
Component : CA SYSVIEW Performance Management Option for DB2 for z/OS
It seems that the FILTEROUT GROUPs are filtering every thread out.
Take a look at your FILTEROUT definitions in the data set 'Prefix.SOURCE(THRDGRPS)' which is named as the THREAD-GROUPS-DSN SYSPARM. See if a FILTEROUT statement is causing the problem.
To check this quickly, you could just comment out the THREAD-GROUPS-DSN SYSPARM from the input.