HA Yellow: How to turn off ZigBee radio completely

Dear all,

I am having a hard time with the ZHA in HA Yellow (for details pls see HA Yellow + ZHA + Philips HUE Motion: Constantly loosing connection (unavailable) - #3 by bodomenke). For this reason I plan to move all ZigBee devices back to Philips HUE bridges.

My question
How to turn off the internal ZigBee radio of Home Assistant Yellow completely? I mean in such a way, that its hardware really doesn’t transmit & receives no signals anymore. I didn’t find an option in the HA Yellow GUI for this.

FYI: I am afraid of inferences, even if I deactivate the ZHA integration because the radio module itself could still be active if not turned off hardware-wise.

Thanks for any help
Bodo