Welcome to the Roku Community, @Joshua1982!
Thanks for getting in touch. We'd be happy to help you check the display type on your ONN Roku TV.
Kindly navigate to your Home screen. Scroll up or down to select Settings > Display type. You may be able to see the display type selected on your TV, and you can choose your preferred one.
Here's the support article related to this for more information: How to change the display type on your Roku streaming player
Feel free to reach out if there's anything else we can assist you with. Hope this helps!
Best regards,
Carly
Carly Y.
Roku Community Moderator