Alias underscore question

Question

i am asking a question where  once we make a feature class and we want to change the field alias because when we first made it  we had underscores. we are trying to get rid of the underscores within the fields tab it allows us to remove it and we can save it but once we bring int he layer in a new map the underscores are still there. does anyone  know why this is?

kenbuja · Answer

Thanks for pointing out that "Current Layer" selection, something I wasn't aware of. Learning new things every day...

Robert LeClair · Answer

To Ken's point, you have to modify the Data Source rather than the Alias for the layer.  To do this, open the Fields Designer, at the top left where it says "Current Layer", click the dropdown and select "Data Source."  Then modify the Alias name.  When you've updated all your Alias'es, click the Save button on the Fields Tab.  The Data Source change is complete and will be reflected in all new Map Views and Projects.

kenbuja · Answer

If you make the change to the field in the map layer, it will only persist if you copy that layer to a new map. You haven't made a change to the feature class itself, just the layer.

However, if you change the field alias for the feature class in the geodatabase itself, then it will persist for any time you add that feature class as a layer to a map. Go into the Catalog view, open the geodatabase and right click on the layer. Select Data Design | Fields and alter the alias of your field.