How to get rid of weird shapes
Hi all!
Sorry if this is a dumb question, I'm a total noob and am just learning for my new job! Using Illustrator is actually a very minor part of this role but my predecessor was really good at it and made a lot of really nice-looking graphics for our company. I'm trying to update some for a presentation but when I go into any of the existing .ai files and highlight a panel, instead of it just being the center panel, this weird shape comes up. Actually most of the .ai files have something like this. Is this a bug? Does anyone know why this happens and how to get rid of it?
Thanks!

