The first link above shows the functionality for creating a feature rectangle in ArcMap.
The second link show this lack of functionality in ArcGIS Pro.
Also in... ArcGIS Pro the sides of a rectangle are labeled "Width" and "Height". In 2 dimensions the sides of a rectangle should be labeled "Length" and "Width". Height would be added for 3 dimensions.
How is this functionality missing and why is the labeling incorrect? It is hard to state how incompetent ESRI looks.