Here is an overview of the most significant changes in the context of CDS view building tools that relate to the:
Creating DCL Sources
As a part of CDS View Building tools, you can now create DCL sources as a new development object that is used to define authorizations for CDS entities.
More on this: Access Control for CDS Entities
Editing DCL Source Code
More on this: ABAP CDS - DCL Statements
You can now take advantage of the outline view capabilities when working with CDS entities and their extensions. When you select one of the structural elements within the outline tree, the cursor navigates to its relevant source code position – as long as the Link with Editor is enabled. In addition, you can sort the order of elements within the outline tree.