Context: The searchBox widget of the InstantSearch.js library has a showSubmit option to toggle the submit button, but the React one does not.
Answer: The React Instant search widget does not have a building option to remove the searchBox submit button; you can only customize it. To completely remove this button, you can customize this widget using the connector.
Sandbox demo: https://codesandbox.io/s/no-submit-no-reset-mkf9r