Your bibliography will be automatically formatted using the output style that is currently selected in EndNote, which you can change from within both EndNote and Word.
In Word, use the Style function on the Bibliography group on the EndNote 20 ribbon to make changes to the bibliographic style. If the required style is not immediately available from the drop-down, it can be found by selecting the Select Another Style option.
For more formatting options use the EndNote Configure Bibliography dialog in Microsoft Word. It opens when you select the launch button at the bottom right of the Bibliography group on the EndNote ribbon (Mac: Bibliography Settings on the CWYW drop-down of the floating EndNote toolbar in Word for Mac). This dialog box is also available from the Format Bibliography button on the toolbar. You can now select from two tabs.