Stopping Endnote X2 from adding all searched references

I am a very new EndNote X2 user (on a PC)

Whenever I search for a citation EndNote automatically ads ALL the search results to my Library. I don’t want it to do this, it doesn’t seem useful to have all these deadend references in my library.

How can I stop it from doing this? I know this is a really basic question but I’m a new user and I can’t seem to find the answer elsewhere.

Many thanks,