If you are managing a team, you can hide certain Tasks from non-admins by changing its visibility.
In each Task window, you'll see a visibility toggle to the left of the description. Clicking this toggle will render the Task invisible to all non-admins and the icon will turn orange:
To make a Task card visible to ALL team members, click the toggle again:
Identifying Hidden Tasks
If a Task is hidden from non-admins, it will say so at the bottom of the Task card, under the budget status: