By doing below code , you keyboard show return key you wanted for example "done", "go"
and also dismiss the keyboard when you press return key in my case done
key while using multi line seamlessly.
import {Textinput, ScrollView, Keyboard} from 'react-native';
// ...code
<TextInput
keyboardType="default"
returnKeyType="done"
multiline={true}
blurOnSubmit={true}
onSubmitEditing={()=>{Keyboard.dismiss()}}
/>