Is it posible to change the "scale" value for an existing field with data type double in ArcGIS Pro?
Alter Field (Data Management)—ArcGIS Pro | Documentation
These are the options, if the field is empty
Out of curiosity, if the table is empty (zero rows), can you change the scale?
What kind of geodatabase? For example, Oracle 18c 10.7.1 enterprise geodatabase.