Wireguard tunnel internet traffic issues

Last time or I stop ( why do you never answer questions??)… do both have publicly accessible IPs. ( capable of hosting a WG server )
Which side should be considered the client and the server for initial handshake OR do users at either end initiate traffic ( be it an admin for config purposes or users accessing devices).

Excuse me but perhaps we did not understand each other, the public IP (Internet) are static and the tunnel works.
The IP LANs are 192.168.1.0/24 on Router A and on the B router B LAN 192.168.2.0/24 and work without problems.
Since the tunnel is site to site I think it means that the two LAN can communicate both sides.
I just want certain IPs of the LAN (A) when accessing the LAN (B), they must only access an IP of the LAN (B).
I hope you understand me

Thank you all

Done asking, the questions were simple as was the request for both configs… Gluck!