Unless Ephemeral mode or multiple sign-in is on during the user's session, setting ArcEnabled to True turns ARC on for the user. Setting the policy to False or leaving it unset means enterprise users can't use ARC.
Registry Hive | HKEY_CURRENT_USER |
Registry Path | Software\Policies\Google\ChromeOS |
Value Name | ArcEnabled |
Value Type | REG_DWORD |
Enabled Value | 1 |
Disabled Value | 0 |