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: