No way to provide style for the TextInput itself

[ikoazoulay]

No way to set fontsize for it for example.

[mrlaessig]

Did you try to set the style on the AutocompleteInput prop?

<Autocomplete
  style={{
    fontSize: 20,
  }}
 //...
/>

You can also render your own input by passing a render function into renderTextInput:

<Autocomplete
  renderTextInput={(props) => <TextInout {...props} style={/*...*/} />}
 //...
/>