Hide the earnings tab

Hi, I want to hide the earnings tab inside the analytics section in the instructor dashboard, can anyone tell me how to do it? I tried with the following code but I couldn’t get it to work.

add_filter(‘tutor_dashboard/instructor_nav_items’, ‘remove_earnings_tab’);
function remove_earnings_tab($nav) {
unset($nav[‘earnings’]);
return $nav;
}

I tried with ‘earning’ too

Thanks.