Hello @jenkins1 ...
If you are an instructor, does your "Modules" button have a crossed-out eye icon next to it? If so, you can enable that button but following the instructions in this Guide: How do I manage Course Navigation links?. However, if you are a student and are not seeing the "Modules" course navigation button, this probably means that your instructor has disabled that button in your course for some reason. If the instructor has not purposely hidden that button, then he/she can use the linked Guide I've provided in this response to enable the "Modules" button in the course.
I hope this has helped a bit. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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