How do we remove Add button for "Development Goal" from the line manager's career overview page

Hi,

There is a requirement where line manager should not see the Add button for adding the Development goal to employee. Only Employee should able to add the development goal.

Have tried to use Sandbox page composer but when we try to hide the ADD button it is not visible for Employee also over all site level it is hidden. we need only for line manager to be hidden. And also tried to remove the privilege "Manage Development Goal by Manager" for line manager role but still manager can see the ADD button.

Please advise on the next steps.