The layout at forum by link provided is called Categories and Latest Topics.
To set this layout as default for all new users you need to run setup wizard in web browser again, on your forum:
Just click few times Next until you reach the step #7. Then choose homepage style and click Finish.
You may need to clean refresh the page with CTRL+F5.
If you want to set your personal choice, then choose default home page view in your profile:
