This is an explanatory test for Moodle 3.4.
- As an administrator, access the Forum settings from the Plugins area of Site administration.
- Change Subscription mode to Forced.
- Navigate to a course and create a new forum.
- Expand Subscription and tracking and verify that in Subscription mode the first option in the dropdown is Forced subscription.
- Verify that you can change the mode to a different option.
- Repeat steps 1 -5 but with a different default subscription mode, ensuring you create a new forum in step 3.
- Explore further if possible.