How to see Wi-Fi channel width in Windows?
Solution 1:
I found a software suggestion in a comment on a related question. The software Acrylic Wi-Fi Home, which is a free-for-personal-use application, is 802.11ax compatible and can show 160 MHz networks as well as 4x4.
In the below screenshot you can clearly see that the router has 160 MHz 4x4 enabled.