Hi. Like others who have posted here, it appears Google has removed ability to select 2.4ghz vs 5ghz wifi networks on it's mesh products. My cheap older light and plug products only do 2.4ghz, but I can no longer see a 2.4ghz version of my wifi to connect too. Thus, I can't force my Pixel 6 onto that specific network to manage those lights, etc. Google please fix on next update!
There was never an option to "select 2.4ghz vs 5ghz wifi networks on it's mesh products", it has always been like described here:
It's up to the IoT device manufacturer to create a product and app pairing process to support this standard Wi-Fi feature of combining the SSID for both 2.4ghz and 5ghz.
The issue is usually only the pairing process, if the IoT device has connected to a given SSID it usually handles combined SSID for 2.4ghz and 5ghz fine afterwards.
There exists some workarounds however, for instance: