Yongnuo YN622C-TX E-TTL - Settings; Flash Mode Selection (GR;TTL;Multi)

Long press the [ ] button to switch the flash
mode GR/TTL/Multi.
In GR mode, short press the [ ] button to switch
the current group the arrow pointing to; in TTL/Multi
mode, short press this button can also switch the flash
mode.
Flash Mode Setting: GR/TTL/Multi
Examples:
1.GR
2.TTL
3.Multi
Settings
HCZ MOO