Hello Mr Adrian,
In the control panel, change the icons to large icons
Then you will be able to see the "Tablet PC" icon, click it.
From there you seem to be familiar with how to do set it up, but will go over the next couple steps just in case you dont.
Click "Setup"
Finally, all your screens should turn white with a this text in the middle of the primary screen "Tap this screen with a single finger to identify it as the touch screen. If this is not the table PC screen, Press Enter to move to the next screen".
Press Enter until you get to the monitor you want to use as a touch screen. NOTE: I am not sure if you can use more than one touch screen with Windows 11... yet.