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On the left is a list of all the categories, with the number of modules in brackets. Click on a module category in order to filter the displayed module.
One of the category is named "Favorites" and is empty by default. This serves as a quick way to access the modules you most often need to access to. You can set your favorite modules using the "Favorites" view.
Modules can have one of 4 statuses, each with specific color:
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