By default, Thinkific course sites display up to 6 courses on your course site's landing page:
If you want to change how many of these course cards appear on the page, here's how:
In your Admin Dashboard go to Themes.
In the theme editor, select Snippets in the document tree on the left.
Steps are very clear, just missing one step add the end; click on (File) on the top menu of the theme and choose (Save) in order to save the changes you made
Exactly where you need to make the change depends on which page you're looking to reorder - e.g. the student dashboard, the site landing page, etc.
If you can please start a new thread with the details, I'll be happy to get some instructions together for you :)