As I open a sequence from 2018, (using 2019.67) I find that I have somehow developed some an effect on an existing model that I can't seem to get rid of. The model is of a one car garage, created with a 3 segment polyline. When I drill down to the last strand, the effects appear and I can't delete them. What am I missing to be able to clear out all of the effects from this strand, and then copy what is supposed to be showing there?