Here are several graphical UIs for MongoDB. I was searching for and experimenting with several MongoDB GUIs. My personal preference goes to Studio 3T for its clear, clean and intuitive interface.
In using Studio 3T, it is immediately clear how to go from beginning to finally listing all the collections in your database. However, my only problem with Studio 3T is that there is supposed to be a free personal-use license but the software does not make it clear how the personal-use license can be activated, so it keeps reminding you that you are still using a trial version that needs to be purchased.