Good morning.

I am trying to configure a hAP ac³ device with RouterOS v6.46.8 (long-term)

I would like to disable the wlan2 interface. I can do it perfectly from "WebFig -> Wireless -> wlan2 -> Enabled -> False", but if I then make any changes from QuickSet (WISP AP), the "wlan2" interface is re-enabled.
On the other hand, it is very confusing that wlan1 interface cannot be selected in QuickSet (WISP AP), only wlan2 appears.

Kind regards.

Whenever you use Webfig, do NOT GO BACK TO Quickset.
Quickset is a one time initial setup starting from the default configuration.
Quickset has limited possibilities (e.g. only looks at one specific WLAN) , and does not work as expected if started from a modified configuration.