You can turn off Safe Mode on Android by restarting your device or using the Notification panel.

To get dark mode on your Android device, you'll need to either upgrade to Android 10, or download an app.

Safe Mode helps you identify and resolve problems with your Android device. For example, it can remove viruses and malware from your phone or tablet. It suspends third-party apps, so you can use Safe ...

In a nutshell: Google has been working to bring a "proper" desktop mode to Android for quite some time. The feature was first introduced in 2019 with Android 10, but it wasn't intended for end-users.