Global Mapper v25.0

Feathering doesn't apply to DEMs in Map Catalog

Feathering DEMs (.img in my case) don't seem to feather when using Map Catalog ... Modify Display of Raster Layers ... Feathering ... Feather to Polygonal Coverage of Valid Data.

I typically have 10+ DEMs that require to be merged then exported together, so I would like to use Map Catalog to handle the load, but unfortunately the Feather tool doesn't seem to work in this instance.