Workaround 1

The problem arises due to the lack of capability for Course creators to generate activities. To grant them the ability to create activities within those courses, please follow these steps:

1. Navigate to Site administration > Users > Permissions > Define roles > Edit Course creator.
2. Then, modify the 'mod/*:addinstance' capabilities to 'Allow' for all the necessary functionalities."

Workaround 2

After the Course Creator has created the course using the Topics format:

1. Log in as a manager or administrator
2. Remove the Course Creator's Teacher role in the course and save.
3. Assign the Course Creator a Teacher role in the course and save.

The course creator will now be able to switch the course format to Single Activity Format and select the desired activity type. This kind of defeats the whole point of having the Course Creator role in this situation if someone else needs to intervene.

This is a very short term solution if you have many people creating courses as this intervention by a Moodle Manager or Administrator will need to be repeated on every course by each Course Creator.

1. Log in as an Administrator
2. Create 1 user.
3. Make that user a Course Creator of the default Miscellaneous category which is created when you first install Moodle (same results regardless of the category).
4. Log out.
5. Log in as the user created in Step 2.
6. Navigate to the Miscellaneous category.
7. Click the Add a New Course button.
8. Set the Course Format > Format field to Single Activity Format.
9. Wait for the page to reload (takes a few seconds).

The Type of activity dropdown field should be populated by all of the different available activity types.