I have a widget I can't find to delete it

[eeetee]

Hello again! I put a placeholder on a page and embedded a youtube video in it and it worked as expected. I have deleted it and replaced it with a smaller size. Now the large size thumbnail is stuck at the bottom of the page when I preview it. I moved the second one to a different page but still have the large thumbnail at the bottom. How do I find the missing widget? I attached the xar file. The page is "technical".

Thanks in advance!

Ed