Go to Settings General Accessibility ICLOUDIN V_3.0 iCloud Bypass Software and choose Display Accommodations. Then click Invert Colors.
ICLOUDIN V_3.0 iCloud Bypass
Software [iOS 13 | iOS 12.4 | iOS 12.3.2]
By the way, here are five more iOS 13 features. That Apple could be holding back for the iPhone 11. So iPhone 11 Not Release Officially. So there is no need to download or install any tool such as ICLOUDIN V_3.0 iCloud Bypass Tool.