Instant formatting enables you to watch the reference list (bibliography) appear as you insert citations. If you are writing a long or complex document such as a thesis, it is recommended that instant formatting is turned off as it can be time-consuming to reformat each time a new citation is inserted.
When finished writing the document or if you want to see a draft, click on Update Citations and Bibliography to format the citations and reference list.
To continue work on the document, unformat the citations using the Convert Citations and Bibliography option.