Need help to set up Gledopto Elite 4D-EXMU (Model: GL-C-618WL)

Hi there
I have Gledopto Elite 4D-EXMU (Model: GL-C-618WL) controller with 4 channels.

I have 1 ledstrips connected to channel 1 (Gpio 16) and the second connected to channel 2 (Gpio 12).

How to I setup wled to treat the 2 ledstrips as one, meaning when I run the preset “turn ON” they should both come on.
And of course the same with preset “turn OFF”

Can anybody help

Set all the LEDs as 1 segment. Segments - WLED Project