How do I reset the window to create a NEW video from a start and end image and prompt?

First of all, I've attempted to make several videos, and I have not been able to use even a single one of them. In my last few attempts to create an image, I noticed that whenever I said "Do not add additional objects or backgrounds to the image" it would do the exact opposite. It is as though it read "Do add." After trying several times, I decided to give up and start with a new image. I noticed that the window in which I put the starting image and prompt still showed my previous attempts, and I do not see any way to delete them. So when I uploaded  my new image, and added a prompt, it acted as though I were working on the same project, adding the wrong instructions from before to the current image. How do I reset the window so I am starting fresh, and it has forgotten the previous projects?