when I try to launch the game everything is normal but after the unreal engine intro or something ended then the whole screen Is just black and I cannot close the game

something vaguely similar sometimes seems to happen to me (Note: It doesn't stop me from proceeding and playing)

Have you tried just clicking in the game window after that?
Side question: do you have SteamVR installed? This could be getting in the way as well - the only way around this part would be uninstalling SteamVR (disabling it)