Since Tubi is not an app you can install through the Google Play Store, you can only see Tubi on your home screen if it is in the Sony Select Featured Apps Row.
How to re-enable Sony Select Featured Apps Row:
- Turn ON your Sony Bravia TV.
- Use the remote control and navigate to Settings.
- Navigate to Apps.
- Navigate to System Apps.
- Navigate to “Sony Shelf”.
- Navigate to “Notifications”.
- Switch to “ON”.
- Restart your TV.