Within Teamwork Projects, you can mark any of your projects as complete in the project's settings.
Go to the Overview tab of the project you want to complete.
Click the options button (three dots) in the top right and choose Complete from the Manage Project section.
If the project has been assigned start and end dates, you can also complete the project by clicking one of the dates in the pane on the left side of the Overview section. You can also do so via the edit pencil.
In the project dates modal, you will see an option at the bottom to mark the project as complete. Click Set Project Dates to save the changes.
The project details sidebar in the Overview tab will be updated with a note of completion.
Note: Completing tasks and milestones will not automatically complete a project so you need to mark the project itself as complete.
For more information, see: Completed projects