Navigator.ts

// ... imports
// If you are using TypeScript, import NavigationTransitionProps, 
// and TransitionConfig
const IOS_MODAL_ROUTES = ["OptionsScreen"];

let dynamicModalTransition = (
  transitionProps: NavigationTransitionProps,
  prevTransitionProps: NavigationTransitionProps
): TransitionConfig => {
  return StackViewTransitionConfigs.defaultTransitionConfig(
    transitionProps,
    prevTransitionProps,
    IOS_MODAL_ROUTES.some(
      screenName =>
        screenName === transitionProps.scene.route.routeName ||
        (prevTransitionProps && screenName === prevTransitionProps.scene.route.routeName)
    )
  );
};

const HomeStack = createStackNavigator(
  { DetailScreen, HomeScreen, OptionsScreen },
  { transitionConfig: dynamicModalTransition }
);

// ... other navigators