We will be adding the kanban view to the Todo tasks with a new addon module. It would be simpler to add it directly to the todo_ui module. However, for a clearer explanation, we will use a new module and avoid too many, possibly confusing, changes in the already created files.

We will name this new addon module as todo_kanban and create the usual initial files. Edit the descriptor file todo_kanban/__manifest__.py as follows:

{'name': 'To-Do Kanban', 
 'description': 'Kanban board for to-do tasks.', 
 'author': 'Daniel Reis', 
 'depends': ['todo_ui'], 
 'data': ['views/todo_view.xml'] } 

Also add an empty todo_kanban/__init__.py file, to make the directory Python importable, as required for Odoo addon modules.

Next, create the XML file where our shiny new kanban view will go and set kanban as the default view on the to-do task's window action. This should be in todo_kanban/views/todo_view.xml, containing the following code:

<?xml version="1.0...