Some people are enrolled in many courses and it can be hard to find a specific Moodle course in the Course Overview listing. In this case, it may be faster to search for a course.
On the Moodle home page, look for the "Browse all courses" link.
Click the link and enter text to search for. A best bet is to search for the department, course number, and semester code. For example "BIOL001 F19". The search will also work with course names but they are sometimes abbreviated.