Note: This was originally posted by an inactive account. Content was preserved by moving under an admin account.
Originally posted by: stonysmithYou MIGHT have been able to back out of change by hitting Undo (Ctrl-Z), but if you've done pretty much anything else to the graph since then, that option is not available to you.
On the third toolbar.. 2nd icon from the left is "Display Local Library". That will display a new canvas that is the local library only. If you need to move the node back to the main canvas, you can use Cut/Paste to move it back, or just delete it and re-add a new one on the main canvas.
(the first icon gets you back to the main canvas)