ReactDOM.render(<Provider store={store}>
    <App />
  </Provider>, document.getElementById('root'));

import React, { Component } from 'react';
import { inject } from "mobx-react";

@inject("store")
class Form extends Component {
  render() {
    return (
      <form className="form">
        <select>
          <option></option>
        </select>
      </form>
    );
  }
}

export default Form;

import React from "react";
import { inject } from "mobx-react";

const App = () => {
  return <div className="App">Hello World!</div>;
};

export default inject("store")(App);

<button onClick={() => this.props.store.getUsers()}></button>

const { getUsers } = this.props.store;
  // какой-то код

  return <button onClick={() => getUsers()}></button>;
};