Salut, essaye ça en mode administrateur :
Turn the Game Bar on or off in Windows 10 using the registry
You can also disable the Game Bar using the registry.
1. Navigate to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\GameDVR.
2. Change the AppCaptureEnabled DWORD value to 0 to turn it off. Change it to 1 to turn it back on.
3. Navigate to HKEY_CURRENT_USER\System\GameConfigStore.
4. Change the GameDVR_Enabled DWORD value to 0 to turn it off. Change it to 1 to turn it back on.
Ou jouer en mode fenêtré plein écran
C'est certainement dû à la nouvelle mise à jour de W10 (la creator update)