Follow the steps to set up the multiplayer server:

Step 1. Navigate to Source folder

Step 2. Create a new file and name it as YourProjectNameServer.Target.cs

Step 3. Open the YourProjectNameServer.Target.cs file in any text editor, add the following code, and save it

// Fill out your copyright notice in the Description page of Project Settings.

using UnrealBuildTool;
using System.Collections.Generic;

public class YourProjectNameServerTarget : TargetRules
{
	public YourProjectNameServerTarget(TargetInfo Target) : base(Target)
	{
		Type = TargetType.Server;
		DefaultBuildSettings = BuildSettingsVersion.V2;

		ExtraModuleNames.AddRange( new string[] { "YourProjectName" } );
	}
}

Step 4. Right-click the .uproject file of your Unreal Engine project and select Generate Visual Studio project files.

Step 5. Double-click the .sln file to open the project in Visual Studio.

Step 6. Set the configuration to Development Server and build the project by pressing Ctrl + B

Step 7. Once the build is successful, switch the configuration to Development Editor and build the project by pressing Ctrl + B. Then press F5 to open the project automatically.

Step 8. Navigate to project setting

Step 9. Select Maps and Modes

Step 10. Configure Maps and Modes

• Default Game Mode: Set as BP_ThirdPersonGameMode

• Global Default Server Game Mode: Set as BP_ThirdPersonGameMode

• Editor Startup Map: Set as ThirdPersonMap

• Game Default Map: Set as ThirdPersonMap

• Server Default Map: Set as ThirdPersonMap

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