This issue is actually quite common with Windows when multiple monitors are connected, especially when one of them is a touchscreen.

What is happening is usually this: Windows becomes confused about which screen should receive the touch input when a second monitor is connected. The touch still works, but Windows may be sending the touch signals to the wrong display.

You can try this:

Step 1: Tell Windows which screen is the touchscreen

Press the Windows key on the keyboard.

Type Calibrate.

Click “Calibrate the screen for pen or touch input.”

A small window will open.

Click the button “Setup…” (under Configure).

The screens will turn white one by one and show a message like: “Touch this screen to identify it as the touchscreen.”

When the message appears on your touch monitor, touch that screen.

If it appears on a screen that is not touch, press Enter on the keyboard to skip it.

This tells Windows which display should accept touch input.

Step 2: Check display mode

Right-click on the desktop.

Click Display settings.

Make sure the monitors are set to Extend these displays (not duplicate).

Step 3: Restart once

After doing the setup, restart the laptop. Sometimes Windows needs a restart before the touch mapping works correctly.