How to use pencil WITHOUT auto-joining line ends?

I set up an A2 document and tried to draw using the pencil, but Illustrator on the iPad auto-joins the line ends to create a shape. I'm not looking to create a shape. Frustratingly, when this occurs as an automated action, undo deletes the entire line drawn. How do I turn off this auto-join feature? Thanks, I've attached 3 screenshots showing an example of how far (literally) Illustrator misinterprets intent. This is an A2 sheet, so that joining is at least a few cm. The second shape moves the line end and makes the line drawn curved. Can't use the app like this. I need to be able to turn the feature off. I'm assuming the button exists and that I just can't find it. Could anyone help? Thanks.