Use the Phase Tuning override checkbox to override the phase tuning settings in the project’s phase tuning configuration set with average phase tuning settings from the primary trend group associated with the project. This is useful when you want to calibrate phase duration, effort, and overlap to projects in the primary trend group.
Note that if Phase 4 is active, the Phase 4 tuning will still use the project configuration set tuning even if the override checkbox is checked. The trend tuning values override only applies to Phase 1, Phase 2, and Phase 3 tuning factors.