EndNote is designed to work with Cite While You Write (CWYW), and
You might use a formatted bibliography because:
You can work with an unformatted document most of the time, and occasionally click Update Citations and Bibliography, then unformat again.
Note: if there are any errors in the inserted references (e.g. incorrect spelling):
There are two ways of making formatting changes to your list of references:
Mac users - Select 'Tools' > 'Convert to Plain Text'.