Can I modify Layouts or Sections?

You sure can! 

You’ll be able to tweak colors, copy, images, basically anything within the layout or section in a matter of minutes using Divi’s built in productivity tools.

Each section, row and module uses the Divi Builder’s settings as far as possible except where custom CSS is required which is included in a code module for you to edit. 

DiviWP’s Sections and Layouts are compatible with Divi 5.

We’ve tested with Divi 5.0.0-public-alpha.3 and are happy to report no compatibility issues. We will continue to test for compatibility with each new release.

You can read more about how and why DiviWP uses Custom CSS here