OpenWRT with mobile Internet Wireguard VPN

i'Ve done this now

Yes. That looks fine.

how can i make it possbile to see the OpenWRT from my homeNetwork again it was always 192.168.178.35

Iā€™m guessing this is connected to another router? What exactly are you trying to do?

i could connect from the other Router which is his WAN on LAN1 with this IP 192.168.178.35 its from the DHCP from "another Router " his LAN 1 and when i am on LAN 2, 3 4 with 192.168.1.1

This will compromise the security of the device if you ever connect it to the internet or any untrusted network. But if you want to do this, set the wan zone input rule to accept.

Okay Thank you not important, now it should work with OpenWRT Client as Gateway for the Server?

Yes should work