Currently, there is only one view option for Catalog in ArcGIS Pro, which is a simple folder tree. The Catalog in ArcMap had the option to add a Contents Panel which allowed you to see a slightly more detailed view of a particular folder or item in a separate panel. If a stand alone Catalog application for ArcGIS Pro is not in consideration (please reconsider this decision) then please make the Catalog within ArcGIS Pro more usable. Another way to do this would be to include options to customize what details are shown in the contents panel (e.g. file size or date modified). The loss of this type of functionality in ArcGIS Pro (along with the other numerous examples in Add Stand Alone Data Catalog Like ArcCatalog to ArcGIS Pro) is detrimental to efficient data management.