Built-in Geant4 commands can be used to toggle physics processes from the activate physics list to an on or off. In the deactivated state, the process will not be applied to any applicable particles.
This command lists the available processes that can be activated or deactivated.
/process/list
For example, this command will deactivate Compton scattering.
/process/deactivate comp
This command turns it back on.
/process/activate comp
Deactivating Geant4 physics processes is not recommended. We do not support the analysis of events generated with deactivated physics processes.