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Hi John. I'm Greg, 10 years awarded Windows MVP, here to help.
If you have not set the monitors to mirror one another then touching the secondary monitor should not affect the primary AIO monitor. This is all controlled by the PC display adapter, with monitor drivers only providing background support.
The Display driver is so important here that merely updating it is sometimes not enough. So let's try everything possible to get it working correctly:
First make sure you have updated the Display driver from the Dell Downloads page here: http://www.dell.com/support/home/us/en/19/Produ... for your Dell Service Tag on sticker located as shown here: https://www.dell.com/support/contents/us/en/04/...
While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3 and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.
Remove the old driver using DDU https://www.wagnardsoft.com/content/ddu-guide-t... if necessary installing in Safe Mode with Networking (so you have internet), or Safe Mode, accessed by one of these methods: https://winaero.com/how-to-boot-windows-11-in-s...
If this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here: https://www.intel.com/content/www/us/en/support...
or the Nvidia GeForce scanner here: http://www.nvidia.com/Download/Scan.aspx?lang=e...
or the AMD autodect utility here: http://support.amd.com/us/gpudownload/windows/P...
For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver. You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.
Then you will know you've tried everything in addition to Windows Update drivers.
Adjust the screen resolution until it fits and looks best at Settings > System > Display.
Then expedite all WIndows Updates including Optional to see if it pushes Monitor or other enabling drivers.
Check for a monitor driver by expediting Windows Updates (including Optional Updates) in Settings > Update & Security > Windows Update > Check for Updates to install all Updates until no more are offered.
- Try these other fixes from Dell for secondary touch monitor not working properly:
https://www.dell.com/support/kbdoc/en-us/000132...
- Also these fixes for secondary touch monitors:
https://answers.microsoft.com/en-us/windows/for...
https://support.plugable.com/t/touch-screen-not...
https://answers.microsoft.com/en-us/windows/for...
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
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