Clicking a task opens the detail panel. Every field is edited there and changes save immediately — there is no separate “save” button.
Changing the status
Change it in the detail panel, or drag the task to another column on the board. When it moves to “done”, the completion time is recorded automatically.
Adding it to another project
A task can appear in several projects at once without changing its home project. This is for work that belongs to two teams — no copy is made, it is the same task.
Pinning
A pinned task stays at the top of the list in a 📌 section — handy for the few things you are watching day to day.
For a private task, only the assignee and admins see the description; others see the row but not its contents.