How to use my app layout on existent projects?

1. Register a new hook in your current theme
   

   // app/apps/themes/my_theme/config/config.json
   "on_active": ["....."],
   "front_default_layout": ["my_theme_set_custom_layout"] # my_theme_set_custom_layout is the helper name

2. Create the helper for the hook
   

   # app/apps/themes/my_theme/main_helper.rb
   def my_theme_set_custom_layout(args)
     args[:layout] = 'application' # set the name of the custom layout to be used
   end

   Note 1: Don't use 'index' as layout because it exists in your theme and default_theme (new versions will be removed from default_theme)
   Note 2: The template render priority is the following:
   Template:
     themes/default/views/layouts/<my_layout>
     camaleon_cms/default_theme/layouts/<my_layout>
     /layouts/<my_layout>
   
   Directory:
     my_project/app/apps
     camamleon_cms_gempath/app/apps
     my_project/app/views
   
   
   
3. Restart server

Note: There more hooks that permit to customize templates and layouts for each section of frontend, like: on_render_index, on_render_category, ...