Add an option to leave one side of a polygon open

[SallaMäkelä]

It would be great if there was a possibility in ArcGIS Pro to draw a polygon so that you can leave one side of the polygon open (without drawing). In municipal zoning it is highly important to draw a polygon this way. Now ArcGIS Pro doesn´t have a function that supports that. 

Here is a picture illustrating the current situation:

This is the desired situation:

I hope to get this enhancement for ArcGIS Pro in the near future.

[ColeAndrews]

By definition, a polygon is a closed shape. Otherwise, it's just a line. Zoning is usually represented by land area, so you need closed polygons. 

In your drawing, merge those two areas together if they are zoned the same. 

[KoryKramer]

You might play with Mask features—ArcGIS Pro | Documentation (I haven't tried this, no guarantees that you'll get the result you're looking for).  You would need to convert the polygons to lines and use the Create Overpass—ArcGIS Pro | ArcGIS Desktop and/or Create Underpass—ArcGIS Pro | ArcGIS Desktop and generate masking polygons.  Then try feature level masking...