Native app database synchronization between devices

I have a native app with default synchronization configuration. When opening the app on two different devices, the changes made on one device are synchronized and other device is updated with same changes upon synchronization. What I want is to separate the data between the devices. Is there any way other than creating user accounts in the app and associating all entities with the user entity to separate the data per user. Currently I do not have user accounts feature in the app and I do not want to add it. App should work without user login but the data on each device must be independent of other devices.
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