You can see the pupils who are Ever 6 Free School Meals. This is determined by whether they have had FSM Eligibility status set on their Student Profile in the last 6 years. You can see how to add a student as FSM here: Adding Free School Meal (FSM) Eligibility
Go to Students > Demographics > Derived Indicators. Select Background.
Click into the filters to select Ever 6 FSM.
You can also choose to chow the inverse of the demographic - in this example it would show you everyone who is not ever 6 FSM.
You can see a list of students, including their name, year groups, registration form and the dates the start and stop being this demographic.
You can download the table, or click on a student to see more details, or jump to their profile.