I am getting something new and am looking for help to understand it. In the attached pdf, you'll see the shape and a red circle indicating area in question. I have been getting the arrows to adjust size when I click on nodes and don't know why. This just started happening. I'd like to know if this can be turned off again, and why it started to happen.

Hi.

You can untoggle the displaying of the selected node's bounding box in the node tool's toolbar.
Third icon from the right.