Here's how you can disable the touchscreen on your Chromebook 3100 2-in-1:
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Open Chrome Browser: Launch the Chrome browser on your Chromebook.
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Access Chrome Flags: Type
chrome://flags
in the address bar and press Enter. This will take you to the Experiments page. -
Search for Keyboard: In the search box on the Experiments page, type "keyboard".
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Restart: After making changes in Chrome Flags, you will likely need to restart your Chromebook. Click on the 'Restart' button that appears after making the change.
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Disable Touchscreen: Use the keyboard shortcut Shift + Search + 'T' to toggle the touchscreen on or off. (Reference 4)
Therefore, using the Shift + Search + 'T' key combination is how you can turn the touchscreen off (and on) on your Chromebook 3100 2-in-1, after enabling the appropriate flag and restarting.