To change the number of topics (or modules) visible in Moodle:

1. In the Administration Block on the left, click Edit Settings. 

2. Scroll down until you see the heading Course Format, and click it to expand.

3. Locate the Number of Sections dropdown menu. This is the number of Topics or Modules that Moodle is currently displaying. Use the dropdown menu to select the number of Topics you wish to show:

4. Click the blue Save and Display button when done.