Use Groups to organise your references.
There are two types of Groups:
To add a new group click on Groups and select either:
Groups can be organised under sections by creating a Group.
View a video on how to create Groups.
EndNote Creating Groups (Source: Drexel Libraries)
Smart Groups in Endnote X8 (Source: Plymouth University)
You can sort your EndNote library in two ways:
Search your EndNote library using the search box at the top of your screen. If this box is not visible go to Tools > Search library.
Enter search terms.
Your results will appear in a seperate folder called Search Results.