I was working in Adobe Illustrator, making some lines around a photo using the Pen Tool. it worked fine, but for some reason, after I created a new layer and pasted in some shapes, the Pen Tool automatically fills in itself when there are more than 2 sides to it. (see drawing below)
This didn't happen before, and no matter how many times I looked it up, there simply wasn't a conclusive answer to how to disable it. All that I know is that it probably has something to do with "Shape Mode"? (which I can't find any mention of anywhere on the internet) The cursor when making lines is red (it was blue I think) for some reason.
(Sorry if this is a dumb question, I've never used Adobe Illustrator and I'm only using it now because I'm working on someone else's project.)
How can I prevent this from happening?