Notion's Kanban view is a powerful feature that can be used to visualize progress of tasks, subtasks, and projects. The Kanban view is a board-based view that allows you to organize tasks in columns, such as "To Do", "In Progress", and "Completed". This visual representation can make it easy to see the progress of tasks, subtasks, and projects at a glance. Here's how you can use the Kanban view to visualize progress:

1. Creating a Kanban Board: To create a Kanban board in Notion, you can start by creating a new page or database, then choose the "Board" view from the available options. You can also use pre-built templates from the template library to get started quickly.
2. Organizing Tasks into Columns: Once you have created your Kanban board, you can organize tasks into different columns according to their status, such as "To Do", "In Progress", and "Completed". You can also create custom columns to suit your needs, depending on the specifics of your projects or tasks.
3. Drag and Drop: You can use the drag and drop feature to move tasks between columns, this will allow you to see the progress of each task or subtask easily and also see which tasks are blocked or pending.
4. Color coding: Notion allows you to color code tasks, columns and even the board, this will allow you to quickly identify tasks, subtasks, or projects by color, making it easy to see the progress and status.
5. Filtering and Searching: Notion's search and filter function allows you to find tasks quickly, you can also filter tasks by tags, keywords, columns, assignee and more. This can be useful when trying to find a specific task or set of tasks within the Kanban board, and can help you to quickly identify tasks that need attention.
6. Collaboration: Notion's Kanban view also allows for collaboration, you can share the Kanban board with your team members, this will allow them to see the progress of tasks and also add tasks to the board. This is especially useful for remote teams as it allows for a centralized view of the progress of the tasks, even though team members might be working from different locations.
7. Customizable: You can customize the Kanban view to suit your needs, you can change the layout, columns, and properties, add new columns, or hide columns that you don't need. You can also set up different boards for different projects, tasks or teams, and customize them accordingly.

Using the Kanban view in Notion can help to visualize progress of tasks, subtasks, and projects. It provides a visual representation of the progress of tasks and subtasks, making it easy to see what has been done and what needs to be done. It also allows for collaboration and customization, making it a powerful tool for managing projects, tasks, and teams. It can also help remote teams stay updated and aligned on the progress of their work.