I ran a search by Creator (very useful, thank you) which successfully limited my search to only those items made by the specified person. I closed the search window using the X (top right) and was surprised that the restriction to Creator was still in place. Obviously, I re-opened the search window and stopped filtering by creator, but I would have expected the filter to go away when the search window goes away.
This is in 12.1.8 if that is helpful
Microsoft Windows 7 SP1