To be completed by the original poster:
After designing and creating a portrait 1080p layout, I started to add some layout webhook actions. With CMS version 3.x I was able to add +16 layout actions (and even more) without any issues. With CMS version 4, unfortunately I have found that after creating the layout action number 10 (from 1 to 10) , if I want to create the action number 11 it starts to remove the first one (number one) and leaves from number 2 to 11. Thing is, Layout Actions they used to be unlimited. Now I have found with version 4, that it only keeps the last 10 Layout actions. Is there a way to remove or fix that limitation?