@nibovim760 you can technically disable the 6GHz network by designating it as a wireless backhaul only, or set it as its own network SSID. As far as setting up a dedicated 2.4GHz network and a 5GHz network your only options are to set up a guest network or an IoT network running on your desired frequency. Your "main" network SSID can only be set up as a blended 2.4GHz/5GHz network or using one of the above frequencies in the app.

Hope this helps!