add minimize/fullscreen/close buttons

Hi
how to add minimize/fullscreen/close buttons? I guess in c++ or are there other ways? I’m only experimenting with the 3rd person example.

If possible on Ubuntu using Eclipse but thanks for any help. I haven’t done anything in Unreal c++ wise.
Many thanks

Why does this compile but the game doesn’t start in fullscreen.
Added a gamemode c++ class:

#include “MyGameMode.h”

void AMyGameMode::BeginPlay()
{
if(GEngine)
{
UGameUserSettings* MyGameSettings = GEngine->GetGameUserSettings();
MyGameSettings->SetFullscreenMode(EWindowMode::Fullscreen);
MyGameSettings->ApplySettings(true);
}
}

Thanks