Check how to turn on or off sync in Chrome below.
Chrome sync feature lets you easily do this.
Sign into your Google account.

Step 3.In the pop-up window, click This was me to confirm your account and clickContinuebutton.
Step 4.Click Yes, Im in to confirm to turn on sync in Chrome.
This willsync your Chrome bookmarks, passwords, history and more on all your devices.
Scroll down to findEncryption optionssection.
you’re able to tick Encrypt synced data with your own sync passphrase and enter a secure password.
Click SAVE to encrypt your Chrome synced data.
ClickTurn officon next to the target Google account.
Click Turn off again in the pop-up window to confirm the action.
Optionally you could tick Clear bookmarks, history, password, and more from this rig option.
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This post introduces how to turn on or off Chrome sync.