This tutorial shows you how Achieve Planner supports the structured style of work and how you can use your project blocks to get your work done.
The most common way of working with project blocks is to take advantage of the appointment reminder that comes up when the project block start time arrives.
When you select a project block appointment in the Reminders Window, the View Tasks button allows you to go to the Tasks tab filtered by that project.
That will allow you to focus on just the tasks for that project and start working on the most important task first.
Another way to get to the Tasks tab when using project blocks is to right-click on a project block in the weekly schedule. You can use the View Tasks command in the context menu to take you to the Tasks tab filtered by that project.
Once you are in the Tasks tab, you can easily switch to a different project using the Project dropdown in the view bar, or using the Actions -> Switch Project (Ctrl+H) menu item.