How to remove black overlay on status bar on android with React Native

I'm learning React Native (without React knowledge), but my problem is the status bar always get a translucent black background and I can remove it. I tried every stackoverflow answer, and even React Native and Expo documentation. But nothing...

Here is my problem:

The status bar has a white background supposedly, and get this grey overlay, that is what I want to remove.

Here is my code:

render() {
    return (
         <View>
             <StatusBar background="white" />
             <Button title="Sign in!" onPress={this._signInAsync} />
         </View>
    );
}

I even tried this, on app.js

"androidStatusBar": {
    "backgroundColor": "#C2185B"
},

I'm starting to think, this is related to Expo.

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