You can talk to your Google Assistant on your Pixelbook by saying "Ok Google" or "Hey Google." This is called the hotword.
If you turn the hotword off, you can still talk to your Google Assistant by pressing the 
Other external keyboards:
- ChromeOS-compatible keyboard: Press + a
- Windows or Mac keyboard: Command/Windows + a
Turn "OK Google" on or off
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In the bottom right, select the time to open the status area.
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Select Settings
Search and Assistant.
- Under "Search and Assistant," select Google Assistant.
- Turn "Ok Google" on or off.
Search and Assistant.Note: If your Google Account was set up through a K-12 school or non-profit group, or you have an .edu email address, you won't be able to use "Ok Google" on your device.
Learn how to use Pixelbook with work or school accounts.