disable 802.11b

ANy help appreciated. When i tick 'Disable 11b'in Wireless Mode, InSSIDer shows that i have a config mismatch and indicates that one node is broadcasting on b/g/n/ac/ax and the other is g/n/ac/ax?

Hello! Does anyone have an idea how can I *completely* disable legacy rates for my AC88U? I have set 2.4Ghz wireless mode to N Only however pcap shows beacons are still sent at 1Mb/s. I don't have b/g devices on my network. 802.11 radio information PHY type: 802.11b (4) Data rate: 1.0...