Setting the policy to True turns High-contrast mode on at the sign-in screen. Setting the policy to False turns High-contrast mode off at the screen.
If you set the policy, users can temporarily change High-contrast mode, turning it on or off. When the sign-in screen reloads or stays idle for a minute, it reverts to its original state.
If not set, High-contrast mode is off at the sign-in screen. Users can turn it on any time, and its status on the sign-in screen persists across users.
Note: DeviceLoginScreenHighContrastEnabled overrides this policy if the former is specified.
| Registry Hive | HKEY_LOCAL_MACHINE |
| Registry Path | Software\Policies\Google\ChromeOS |
| Value Name | DeviceLoginScreenDefaultHighContrastEnabled |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |