You can create automated workflows in Projects via section types.
Automation-1: When you complete a task, move task to the desired section automatically.
Click "..." icon on the section and select section type "Done".
Automation-2: When you undo a completed task, move task to the desired section automatically.
Automation-3: If you do not want to change section of tasks automatically when the statusses changed, you should select section type as "None".