I was in a couple areas recently where my Pixel 6 indicated I was in 5GUW mode, including Lowell MA, which isn't even indicated on the 5G map as having UW.
When I was in 5GUW mode, I couldn't use the internet AT ALL. I couldn't get directions, check emails, or any function that needed data. I had to drive in a random direction to get out of 5GUW coverage in order to get directions to my next stop. It was very frustrating.
Verizon appears to have disabled every mechanism by which you could at least temporarily disable 5GUW, or even 5G. How can I disable UW?