Avast displays wrong LAN name

My wifi has two networks,2,4 Gb and 5 Gb. All my devices connect to the 5Gb network, my laptop, my TV, our phones… but Avast on my laptop stubbornly displays the 2,4 network.
I suspect that is why I can’t run Samsung smart view and mirro my laptop to the tv - different networks.
I haven’t found any setting to change this.

How do I do to convince Avast to change this?

All my devices connect to the 5Gb network.......
And you are absolutely sure?

Absolutely sure

Delete network connection from computer, reboot and create a new connection

Any change ?