We're currently using Pro 2.7 for multiscale mapping, and we're looking for a way to alter symbology (color or texture) for a Single Symbol symbology type. This functionality is available for Unique Symbols (see image below), but is not available for Single Symbol types.
This is a much needed functionality for controlling the appearance of a layer at different scale levels (such as color, transparency, thickness, etc.).
Please note: we do not want to add the layer multiple times to the map to symbolize as this taxes the end client and isn't best practice for caching.