Lenovo ThinkPad Helix 20CG User Manual page 30

Put the tablet into sleep mode or wake up the tablet
If the cover is open and the tablet is on, the tablet, by default, enters sleep mode automatically after you
close the cover.
If the cover is closed and the tablet is in sleep mode, the tablet, by default, resumes normal operation
when you open the cover.
You also can change the settings so that by closing the cover you can shut down the tablet, or do nothing.
To achieve this, you must change your lid settings by doing the following:
1. Go to Control Panel.
2. Tap Hardware and Sound ➙ Power Options.
3. In the navigation panel, tap Choose what closing the lid does.
4. Follow the instructions on the screen to choose an option according to your preference.
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ThinkPad Helix User Guide