If you opt out of/stop reporting rent, you could lose the credit history you built while reporting your rent. Losing your rental credit history will remove a positive tradeline that can impact your credit report and score.
If you complete your lease and stop reporting, your rental tradeline is shown as a closed tradeline in good-standing.
To stop rent reporting, click the 3 vertical dots next to Reporting and click Disable reporting
Then click "I still want to turn off reporting" to disable reporting