In your course view, click on the Filter drop-down menu. Select Hidden from me.


Courses page with All Courses selected in the Filter drop-down menu


In the hidden courses area, navigate to the course you are unable to see, and click on the properties (three dots on the right).

Choose Show course.


Arrows pointing to three dots on right-hand side and Show course in the menu


The hidden course should now be available in your courses page.