Please follow the steps below to restart the application on your iPhone without a 'Home' button (X or later):
- Swipe up from the bottom edge and pause in the middle of the screen.
- Swipe up on the app's preview to close the app.
- Go to the Home screen.
- Reopen the app in question.
There is how you can restart the app on iPhone with a 'Home' button:
- Double-click the 'Home' button to show your most recently used apps.
- Swipe up on the app's preview to close the app.
- Push the 'Home' button.
- Reopen the app in question.