Smart Compose, a feature powered by machine learning, provides you suggestions while composing an email in Gmail.
It is an experimental feature. Keep in mind that experimental features may be removed at any time without any notice.
However, if you want, you can enable it at any time you want. Here's how you can enable Smart Compose in Gmail web version:
That is all. The Smart Compose is enabled successfully. Now, compose an email, and you can see suggestions.
If you want to accept the suggestion, press "Tab" key. Otherwise, continue typing.
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How to Enable Smart Compose in Gmail