There is currently no way to select in which layer a new path will be drawn into within the Navigator when using the Pen tool.

Currently, when the Pen tool is wielded, and a shape is drawn, the path will be placed within the lowest-in-the-list compatible layer within the Navigator's hierarchy.
For a user to select where a path is placed, they must first accept this, draw their shape, and then manually reposition the path in the Navigator's hierarchy to their desired location. (or, they must Lock all layers except for the desired target layer)
It is very inefficient, and potentially frustrating to not have control over where a path is drawn. This is compounded even further by large layer hierarchies where a user may have to 'hunt' for where their shape was drawn.

Instead, the Path should be drawn directly within the currently-selected layer within the Navigator.
If the currently-selected layer is not able to receive a Path within, then it should likely be drawn within an automatically-generated Canvas panel, directly under the selected Navigator layer, at the next most-compatible destination.

Note that the same issue occurs with Ellipse, Rectangles, and Lines.