UR44 - Unable to disable direct monitoring

OS X Yosemite (version 10.10.5)
Yamaha Steinberg USB Driver v.1.9.10

I recently acquired a Steinberg UR44 USB external sound card so I could do live quadraphonic performances using MaxMSP. However, I do need the ability to turn off direct monitoring, as it interferes with the possibility to willingly choose which input to use or not.

There seems to be no way to let a software turn it off, it is always on. I went through the manual, to no avail.

Is there something I can do? Or is this completely mandatory?

Any guidance is appreciated.

I obtained a reply in https://www.steinberg.net/forums/viewtopic.php?f=157&t=112291