I found it. I clicked on Manage My Wi-Fi. Then at Primary Wi-Fi network I turned off Whole Home Wi-Fi. After that an Advanced settings button appeared. Clicked on the button and I was able to turn off the wi-fi signals.
I want to do the same thing. I went in to Valerie through 192.168.2.1. But there is no option to disable the wi-fi signals. How did you disable the wi-fi signals? Thank you in advance!