There are exotic devices like FireOS from Amazon. Where this setting is hidden by the device manufacturer. Autofill Changer will change the autocomplete provider on smartphones, where the manufacturer has hidden it.
With the Android version of Oreo (8.0) was intoduced new feature for to automatically fill different input fields in third-party apps, like password managers. And in most Android devices this setting is available for the user.
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But there are exotic devices like FireOS from Amazon. Where this setting is hidden by the device manufacturer.
Autofill Changer will change the autocomplete provider on smartphones, where the manufacturer has hidden it.
Actually, the app does nothing special. At startup it opens the default settings of the AutoFill device, where you can change or add service.
Unfortunately, if the setting is not hidden, and removed from the system, then there is nothing you can do.