Should i write codes in dedicated server.sln file for browsing sessions?

Now i’m using listen server and planning to make my game run under dedicated server and make sessions so users can browses games to join.

I already watched how to build dedicated server and going to follow the step.

I tried to solve this question on my own but have not enough space in my PC.

so one thing qurious is that,

if i let a client make a session and other clients browse it, do i need to write codes for dedicated server in server.sln? or can i just handle in UE editor?