To prevent a ChromeOS device from shutting down while idling on the sign-in screen, you need to adjust the power management settings. This can be done through the following steps:
* Go to the Google Admin console.
* Navigate to Device Management > Chrome Management > Device Settings.
* Find the Power management section and locate the setting that controls idle behavior on the sign-in screen.
* Adjust the setting to prevent shutdown during idle periods.
Option A is incorrect because idle settings primarily control screen dimming and sleep behavior.
Option B is incorrect because user experience settings generally focus on visual and interaction aspects, not power management.
Option C is incorrect because there isn't a specific "Allow shutdown" setting in ChromeOS device settings.