Sign out of iMessage on a MacBook (https://datarecovee.com/knowledge-base/how-to-sign-out-of-imessage-on-mac/) is a straightforward procedure which can simply be done in the Messages app. You just need to open the Messages app on your MacBook. Then, from the menu bar, click on Messages and select Preferences. After that, go the iMessage tab to see the Apple ID associated with the app. Click on Sign Out button to log-out of the iMessage app. When you finish signing out, your MacBook will stop receiving iMessages through that account. This feature is useful in various cases like change of accounts, problems in message delivery, or when you want to change the device.