Google has extended Smart Compose from Pixel Phones to most other Android smartphones. And while this may be practical, it can also be embarrassing if the suggestions are wrong. If you do not like it, turning it off is a simple process.
Smart Compose will finish your sentence for you
Smart Compose should not be confused with Smart Reply. Smart Reply will review the e-mail you received and suggest prompt answers that would be appropriate. An email requesting a meeting tomorrow could result in a suggestion of an intelligent response: "That would be great," and so on.
Smart Compose, on the other hand, is for email that you are actively typing (see the header image of this message). Think of it as something like Swiftkey on steroids. But the difference is that Swiftkey tries to predict the next word as you type and Smart Compose will try to predict the rest of your sentence. If you have entered, "I am free for that", Smart Reply can suggest "Unch on Saturday". If you like the suggestion, you can sweep the words (not your keyboard) to accept them.
But not everyone is a fan of predictive text – you may find it boring, intrusive or not enough of your writing style. Fortunately, Google has implemented a simple process to disable Smart Compose.
How to disable Smart Compose
Open the Gmail Android app and tap the hamburger menu in the upper right corner.
Tap an email account (you'll need to repeat this procedure for each email account).
Scroll to the Smart Comose option and press the checkbox to deselect it. You can also disable Smart Reply here if you wish.
And you're done, you should not see Smart Compose suggestions anymore. If you have more email accounts, repeat the process for them. And if you decide you want Smart Compose suggestions, just double check the option above.