Hi Shola,
Thank you for the explanation.
I figured out how to get the effect on the AUX and my MixPad config looks exactly the same as on your screenshot.
The only thing that I couldn’t figure out is why when I turn down the input channel fader on the MIX LR, the effect on the AUX is gone.
Based on Keith’s explanation I understood that it’s happening because the FX sends from the input channels are set to post fader by default, so when I adjust the level of an input channel in the main LR mix, the level of the send to the FX unit is also adjusted.