Help with Wi-Fi bridge

hello everyone
I'm using archer c50 v4 with openwrt 19.07
and i used the guide for extending Wi-Fi signal (relayd)
and it works but when i cheack with double router detector it shows two routers !!!
all the devices connected to the second router (c50 v4) takes ip from the main one
all i want is just extending Wi-Fi signal and everything handled by the main router is that possible ?