Making changes in loop properties -trouble clicking in the flow panel

Hi, I am a total newbie to psychopy and am having trouble re-opening the loop properties box in order to make changes. In the videos it seems to be as simple as right/double clicking the loop in the flow area but nothing clicks for me in the flow panel. my computer is runing on windows 7 can that be the issue?
thanks for your help!

I haven’t had an issue with Windows 7 but I think it’s a single left click

thaks wakecarter! A left click does not work either. no clicking works