How can I get touch to work on monitor that is not my main display?

[Microsoft Windows]

After some research, my understanding is that touch input can only control the main display. The problem is that my new touchscreen monitor is not my main display. My main display is not a touchscreen monitor. Since Windows did away with Tablet PC settings, it seems that I can't use a second monitor as a touchscreen unless I make it my main monitor. My main monitor is 49" with 5120 x 1440 resolution. My touchscreen is a 7" monitor. You can see why I don't want to make that my main monitor. Please tell me there's a way to make touch work on my secondary 7" touchscreen monitor! Thank you so much

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