Question about free version of TeamViewer

I downloaded the free version of Team Viewer yesterday to assist in tech support for my printer. The support person took control of my computer using Team Viewer briefly while we worked on the problem. I thought I had called Canon directly. We didn't get very far before I had some red flags go off in my mind that this was NOT Canon, so I ended the session and immediately uninstalled TeamViewer. I checked with Norton to determine that nothing seemed amiss, but is there any way this person can still control or monitor my computer using TeamViewer on THEIR end IF they did not install anything nefarious during the session? Thanks!