HI @Community Alums ,
This happens because if you have already personalized your List Layout then making the change through the setting I mentioned above will not work. You need to first follow the steps as I mentioned above and then make your selection as Reset to column defaults to apply the changes.
In case if this needs to be done for all users then you need to follow below steps:
1. Perform all the steps I mentioned above.
2. Navigate to sys_ui_list.LIST table.
3. Search for the table name where you want to apply this default list column changes.
4. Search for the view in which you want to make this list layout changes to.
5. Now you need to delete the records where User field is filled in as shown below, there should be just one record with User as empty which will be the changes you made above as mentioned before.
Doing this will not give you reset to default column warning and will be applicable to all users.
Do perform this in Lower prod environment first before pushing it to PROD instance.
