The newest version of Mendeley, Mendeley Reference Manager, now refers to folders as "collections." There is no difference in functionality compared to the previous version; only the name has changed.
To create a folder, look at the sidebar on the left side of your library and scroll to the section labeled "Collections." Click on the italicized text at the bottom that says "New Collections." Type in the name of your folder and hit enter.
It is also possible to create a subfolder, or a folder within a folder. To do that, create a new folder using the same method as before. Then, single click and drag your new folder into the desired folder.
There are two ways you can add articles to folders: you can import them directly from your computer, or you can move a document that’s already in your Mendeley library into that folder.
To add a document that is saved on your computer, open your desired Mendeley folder by clicking on the name of the folder on the left side of the screen. Then, click on the “+ Add New” icon at the top left of the screen, click "File(s) from computer," select the file that you want to add, and click “Open.” Your document will now appear in your folder.
To move a document that is already in your library into a folder, locate that document in your library by clicking on either “All References” or “Recently Added” on the left side of the screen. When you have found the desired document, single click on it and drag it into the desired folder on the left side of the screen.
