Launch arguments

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There are several launch arguments that alter the behavior of the game when used. All launch arguments have to be entered with a hyphen either into desktop shortcut address, command line, Steam launch options, or Epic Games additional command-line arguments field.

List of known launch arguments

Argument	Description
AUTH_LOGIN	Unknown
AUTH_PASSWORD	Unknown
AUTH_TYPE	Unknown
d3d10	Forces DirectX 10 to be used (may not work)
d3d11 DX11	Forces DirectX 11 to be used
d3d12 DX12	Forces DirectX 12 to be used
-graphicsadapter=X	Explicitly select video card adapter by index number
vulkan	Forces Vulkan to be used
epicapp	Used when launching the game from Epic Games; the stable branch is set to Crab, experimental to CrabTest
epicenv	Used when launching the game from Epic Games
EpicPortal	When used standalone, the game will skip login to Epic Games and launch all sessions in offline mode, usage with Steam unknown
epicusername	Used when launching the game from Epic Games, set to the currently logged in user
epicuserid	Used when launching the game from Epic Games, set to the currently logged in Epic Account ID
epiclocale	Used when launching the game from Epic Games, set to the locale of the launcher
NO_EOS_OVERLAY	Used when launching the game from Steam, prevents EOS overlay from appearing
NoMultiplayer	Disables all multiplayer related connections in-game by preventing the game to connect to EOS
NoSteamClient	Prevents Steam from starting when playing on Epic Games
USEALLAVAILABLECORES	Forces the game to use all CPU cores
nothreadtimeout	Disable the max waiting time of 120 seconds for the rendering threads
nosplash	Disables the splash image on launch
DisableSeasonalEvents	Disable Seasonal Events

Other launch arguments can be found in the Unreal Engine 4 Documentation, although they may not all be functional.