This layer's data source is a feature class inside a compressed file geodatabase. A compressed file geodatabase is read-only.
Solution:Uncompress the file geodatabase.
Warning: Data is compressed
ArcGIS Desktop is in mature support and will be retired March 1, 2026. There are no plans for future releases of ArcGIS Desktop, and it is recommended that you migrate to ArcGIS Pro. See Migrate from ArcMap to ArcGIS Pro for more information.