Legacy 802.11b data rates (1, 2, 5.5, 11 Mbps) exist because Wi-Fi is designed to be backwards compatible with all potential clients. This means that frames which need to be heard by all clients (management and control frames) are transmitted at legacy data rates resulting in higher airtime utilization and lower data throughput. 802.11b is very old Wi-Fi technology, first introduced in 1999. It is unlikely that you will have any 802.11b clients on your network, so we recommend disabling these low data rates.
Identifying information (MAC addresses, SSIDs) have been removed from the below screenshot.
Instructions from UniFi Controller running firmware version 8.1.113.
Be wary of increasing the Min rate above 24Mbps, as you can start to introduce issues for some clients on your network.