It is impossible to completely delete the default settings on an Android device. Superuser rights are required, so-called root-rights. But if you do something wrong in the super user mode, there is a high probability that the entire device will not work correctly, or the phone will turn into a brick. I can recommend the easiest and at the same time the safest way to disable standard applications - freezing. Here https://tvoy-android.com/zamorozka-prilozheniy/ has detailed step-by-step instructions.