Whenever you display classifications of objects without specifying which characteristics you want to look up, the system displays the default characteristics.
This holds true for both the Repository Browser (Display → Classification) and for transaction SCLAS, where you can leave the input fields for the characteristics empty.
The default characteristics are part of the individual ABAP Workbench settings. To change the default characteristics, proceed as follows:
A browser for characteristics appears.
The picture of the icon changes:
Changing Default Characteristics