Edit ShooterUI.ini in documents

[ShooterGame.SGUIHUDIFFObjectAlly]
m_PrimaryColor=(R=0,G=255,B=000,A=255)

[ShooterGame.SGUIHUDIFFObjectEnemy]
m_PrimaryColor=(R=255,G=000,B=000,A=255)

[ShooterGame.SGUIHUDGameplayNotification]
m_HighlightedBGColor=(R=255,G=255,B=255,A=255)
m_TargetColour=(R=255,G=255,B=255,A=255)

[ShooterGame.SGUIHUDGameInfoScore]
m_EnemyColor=(R=255,G=000,B=000,A=255)
m_TeamColor=(R=0,G=255,B=000,A=255)

[ShooterGame.SGUIHUDActionMenu]
m_AlliedColor=(R=0,G=255,B=000,A=255)
m_EnemyColor=(R=255,G=000,B=000,A=255)