Step 1: Login to your Moodle Instructor Dashboard
Step 2: Click on Desired course:
Step 3: Click on the "Turn editing on" button at the top-right corner:
Step 4: Then click on "Edit" next to the desired test/exam and select "Hide" to remove the selected test/exam from all students' Proctortrack dashboards.
Step 5: After hiding the test, you will see "Hidden from students" below the selected test.