Related: Edit lyr files properties in ArcGIS Pro - Esri Community
Like LYRX, we can't edit the properties for MAPX and PAGX files in Catalog.
Being able to do so would allow us to make quick changes to our templates (changing the data source of a layer, changing layer symbology, etc.) without having to load and re-create the template file.
Please give us the option to manage our Template files' contents via Catalog
