The Topics Format as you can see is just a list of numbered topics with no context. This allows you to decide how to structure and order the content. First, let us put some structure to this empty course by adding the titles to each topic.
From my sample lesson plan I have my three lesson titles, so I will use these to name my topics as follows:
In Topic 1 (with the number one beside it) click on the Edit icon.
Un-tick Use default section name. This allows you to customize the topic title for navigation.
Type the lesson name into the Section name field. I always use topic1 as the introduction to a course rather than topic0, so let's put Introduction here. However, why I recommend this needs explanation.
When you use the facility to focus on one topic at a time in a Moodle course, it shows topic0 and the topic you are focusing on. So if you put much more than the course name, and perhaps the intro forum in topic0, it pushes the topic you are looking at...