React native difference in react native project directry structure

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While creating an app in react native, I didn't get sub directories like android,or IOS. I Used create-react-native-app command.

New version of CRNA integrates Expo Toolkit, and android and ios folders are hidden. If you want to separate these folders, you must detach expo from react native app. 

npm run reject

You can read more detail at CRNA's github

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