Disable shape detection in Preview's annotation tools When I try to draw a line on an image using Preview's annotation tools, it doesn't remain as I drew it but instead the line is drawn linear. How can I set it to be preset as nonlinear?

So looking to the images, I don't want it to be set like this:



Instead I want it to be preset in this way, instead of clicking the actual function everytime to make it nonlinear.
It's currently not possible to disable the shape detection used by default in the markup tools.

If your drawing is recognized as a standard shape, it’s replaced by that shape; to use your drawing instead, choose it from the palette that’s shown.

Source: https://support.apple.com/kb/PH20218
You can provide feedback to Apple here:

http://www.apple.com/feedback/macos.html