To set the initial screen that displays when your prototype loads:
Click Share at the top right of your prototype dashboard.
Click Link Settings at the bottom of the share modal.
Set the initial screen that displays when your prototype loads using the drop down menu next to Start the share link at.
This will create a brand new URL you'll need to share. If you’ve previously created share URLs that do not have this setting applied, you’ll need to revoke those if you no longer want them to be accessed.
If you're using the InVision iOS App, the prototype will automatically update within the app.
If this is for a mobile project that you've saved to your home screen on your Android, you'll need to delete the existing icon, then access the new URL and re-save.