-emulatestereo command not working

Hi guys,
i know i’m very lete on the topic, but i can’t figure out where do i need to use this flag.

I’m on windows and i’ve created a shorcut with the “-emulatestereo” flag for the EpicGamesLaungher.exe and UnrealEngineLauncher.exe executables, but both the times i got my project started normally as i could see.

Am i missing something? What should i exactly see if the flag would work correctly?

Thanks everybody for any clues