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//You can apply app:boxStrokeWidth="0dp" and app:boxStrokeWidthFocused="0dp" (or theapp:boxStrokeColor attribute using a selector with the same values of the boxBackgroundColor).
<com.google.android.material.textfield.TextInputLayout
app:boxStrokeWidth="0dp"
app:boxStrokeWidthFocused="0dp"
>