Within Teamwork.com, you can pin task lists so they remain open on your project.
By default, the task list will be hidden from the Table and List areas when all tasks in a task list have been completed.
You will see these lists under Completed Task Lists in the task lists panel on the left of the tasks view.
To pin an active task list and prevent it from being closed, click the options menu (three dots) to the right of the task list name. Click the Advanced option in the dropdown menu, then select Pin this List.
Once the task list is pinned, it will always remain visible as an active list in the Table and List area unless it is unpinned.
To pin an already completed task list, select the list from the Completed Task Lists area to open it. While viewing the task list, click the options button (three dots) in the top right and select Pin this List. The task list will be moved back to the active lists section.
You can unpin a task list via the task list options menu. Select Unpin this List from the Advanced section.
In List view, you can also unpin a list by clicking the pin icon to the right of the task list name.
Note: Only administrators or users with permission to update task lists can change this setting.
For more information, see: Creating a Task List