So that was the answer. If it isn't there then OneMesh is not supported or planned to be supported.

Have you browsed the router logs, anything pointing to the issue you are experiencing ?

Your wireless settings seems fine. Did you try to set Auto for channel number and width on 5Ghz band ? Does that make any difference ?

@Bandesz Try to set wi-fi settings like : For 5 GHz - identically , just set Mode to 802.11n/ac mixed. Use your ISP default DNS which should be automatically set if you Internet connection type is...

@Marin03 Look at that thread - it might be possible to restore the stock FW with that procedure. Or you can try that guide as well.

Right, so in AP mode they are present as well. These are the OneMesh feature hidden networks. So far in the Web interface there's no possibility to turn them off. Let's hope in the future FW releases...