It's an expression meaning that you don't mix modes (a/n/ac) but rather stick with just one (ac).Did not see much channel usage for this frequency in the snooper, freq usage or scan. What option is Greenfield. I am currently researching it.
Ah! OK, thanks,The solution he posted involved changing the skin in the web interface. It does not work in winbox.
Click on "Design Skin" and remove the checkmark in front of Quick Set, then save it as default.