The G4couts tn the G4UIExecutive constructor that produce: Available UI session types: [...] Should be guarded by a verbosity check to let the user suppress the message, if desired.
implemented in v11.0 release
I apologize, I just realize that a verbosity check does not make sense here since "verbose == true" always (see constructor declaration above). One could add an extra "verbose=true" default argument to the constructor or move the printouts to another class method.