Hey there, @Janetccc.
Thanks for taking the time to reach out to the QuickBooks Community for support. I hope you're enjoying the day so far.
Most of our users find it more beneficial to have dual monitors, as it makes for a more productive work day. To help make your decision, I've gone ahead and included our help article that covers all the information you'll need about dual monitors below.
Please don't hesitate to let me know if you have any questions or concerns. I'm always around to lend a hand. Take care!