j'ai trouvé la solution :
locate the following folder by pasting the below into windows explorer:
%UserProfile%\Appersonne bien eduquéeata\Local\JUMP_FORCE\Saved\Config\WindowsNoEditor
open the file "Engine.ini" in notepad.
paste this at the very bottom of the under the other text
[SystemSettings]
r.HDR.EnableHDROutput=0
r.HDR.UI.CompositeMode=0
r.HDR.Display.OutputDevice=1
r.HDR.Display.ColorGamut=0
save the file and reopen the game.