The only way to remove a Gmail account from your Android device is by removing its associated Google account. You can stop Gmail from syncing new emails, but if you want to get rid of a certain Google account from your phone or tablet, here’s how.
Removing your Google account means services like Google Maps, Google Play Store, and other apps will become unavailable. It’ll require you to add another Google account to your Android device or have a second Google account already signed in to keep uninterrupted access to these apps.
As mentioned, you can turn off Gmail syncing instead. This will stop Gmail from updating your inbox on your device and leave your account available for you to use elsewhere.
If you’ve decided to remove your Gmail account, you’ll need to have your device handy, although you can sign out of your account remotely if needed.
Turning Off Gmail Syncing
Before we begin, it’s important to point out that the steps to access your device’s Settings menu may be slightly different, depending on the version of Android you have. The steps below should work from Android 9 Pie onwards.
Head into your device’s “Settings” menu either by clicking on the app in the app drawer or by swiping down the notification shade and tapping on the gear icon.
In your device settings, locate and press “Accounts” or “Accounts and Backup,” depending on what it’s named on your device.
Note: On some devices, you’ll need to tap an additional “Accounts” menu to locate and manage your various accounts.
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Source : How to Remove a Gmail Account from Your Android Device
