By creating multiple libraries for your enterprise, you can organize all publications very efficiently so that users can easily navigate through them.
To create a new library you click on 'Content' > 'Libraries' in the top menu,
or on 'Libraries' in the quick overview menu.
Once in the libraries overview you can click on '+ Create new library':
So that a pop-up opens where you can fill in the name in the first tab + assign the library to the relevant user group(s) in the second tab:
In the tab 'Assets', you can upload an icon that will be displayed in front of the library name and/or
a background that is displayed behind the collections when the library is opened:
Tips & tricks:
You can use software like Photoshop or Indesign to resize your image to the exact dimension or use a free online tool like this.