Pan the input to the stereo Mixes

How do I pan the input signal to send to the stereo Mixes?

(PM1D, PM5D, M7CL, and LS9) At the Selected Channel area, Mix Send controls for the stereo Mixes are "Pan" (odd) and "Level" (even).

(PM5D V2) When "FLIP" mode is engaged to the input faders and "PAN" key at the encoder mode is pressed, the Channel Encoders are pan controls for the stereo Mixes from the input channels.

The function assigned to the controls in the mode: (Owner's Manual p.49)
Encoder -- Pan of the signal sent from channels (of the currently selected layer) to paired MIX buses (invalid if MIX channels are not paired)
ENCODER [ON] key -- Channel (currently selected layer) on/off
Fader -- Send level from channel (currently selected layer) to MIX bus
CH [ON] key -- On/off status of signal sent from channel (currently selected layer) to MIX bus

(DM/0): It will be set only with the screen.