When you connect your Kamvas Studio 16 to an external display for the first time, finger gestures on the touchscreen will control the external display and not the touchscreen. You can change the settings to fix it. Once the settings are changed, it will no longer happen.
Kindly follow the steps below:
Step 1: Search " Control Panel" and open it
Step 2: Find "Tablet PC Settings" and double-click it
Step 3: Click on "Setup"
Step 4: Choose "Touch input"
Step 5: Follow the instructions shown on the screen.
Here is a video for your reference as well: