I can't seem to find much reference to it online. Is there an option, as there was in ArcMap, to edit the description and have it display in the legend? I can't find it anywhere...
Hi Tyler,
The layer description can be set in the layer symbology tab in ArcGIS Pro:

To display the description in the legend make sure the description is checked in the legend item properties when in the layout view:

Thanks
Lee
Is this functionality available with only Single Symbol Symbology? I have a layer with multiple features and have unique values as the symbology, but I don't see a description area available for each value. I recall having the ability to add descriptions for all the values in ArcMap.
Finally found where to add descriptions in the symbology for multiple values:
I'm also trying to figure how to display the layer Description in my Legend. ArcGIS Pro 3.3.6.
I have a stand-alone layer, not grouped, with Single Symbol symbology that I've added a Label and Description to in the Primary Symbology properties.
When I select the layer's Legend Item in the Element Pane, "Show... Descriptions" is checked but grayed out, even though "Description" is part of the "Arrangement".
In this state, I can get the "Label" to show in the Legend, but not the Description. There is no indication of items "overflowing" out of my legend area (red ellipses).
I'm wondering if which Layout type I am using matters? For instance, I am using the "Manual Columns" fitting strategy, with Word Wrapping enabled for both Labels and Descriptions.