The brand new tool “Line and Curve” has a weak point,
That is, it cannot remove current anchor and go back to previous anchor.
This will be a trouble when user regret to create current anchor,
please consider to provide [Ctrl + Z] or some control method
to remove current anchor and go back to previous anchor.
Thanks for reporting the bug.
At this time, you can use Edit Path for any available element, then draw a new freeform by selecting Line and Curve.
This way, your new element is in Edit Path mode already, and you can easily add/remove anchor points or edit it the way you want.