Add More Players

Open WBP_CreateGame
Content > BasicMultiplayer > Widgets

Open the event graph and modify the values for MaxPlayers and MinPlayers

You can set the number of players allowed to join sessions by adjusting these values

Add More Maps

Open D_Maps
Content > BasicMultiplayer > Datatables

Add a new row to the datatable at the top of the list

Fill in all the sections of the new row

MapName will be displayed to players in the lobby
MapTexture will be displayed to players in the lobby
ServerTravel will be used when a server travel occurs (it must match the level name in the Maps folder)

Steam Integration

Locate your project's DefaultEngine.ini file
The file path should look similar to this

Copy and paste these lines into your DefaultEngine.ini

[/Script/Engine.GameEngine]
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480

; If using Sessions
; bInitServerOnClient=true

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"

Installing Advanced Sessions

Download the Advanced Sessions plugin from vreue4.com - Advanced Sessions Library
Create a new Plugins folder in your project’s directory

Move the downloaded files into the Plugins folder

Testing Steam

Open your project and confirm the plugins are successfully installed

Launch the game as a Standalone Game to test Steam integration

Create Steam Sessions

Ensure that Advanced Sessions is installed first

Find the WBP_CreateGame
Content > BasicMultiplayer > Widgets > WBP_CreateGame

Find the Create Session blueprint node

Replace the Create Session node with Create Advanced Session and reconnect the lines

Find Steam Sessions

Ensure that Advanced Sessions is installed first

Open the WBP_Matches
Content > BasicMultiplayer > Widgets > WBP_Matches

Locate the Find Sessions blueprint node

Replace the Find Sessions node with Find Sessions Advanced and reconnect the lines to the new node