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face vc should put all its layout inside a scroll View which is a scroll bar if not the small devices it n display
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- Todo conteudo -->
</ScrollView>
in this blog http://requirecode.blogspot.com.br/2016/08/scroll-view-no-android.html will teach you right
Actually my doubt is about android studio, not the layout itself. See my answer which I explain better. But thanks for the answer =)
– Gabriel Stafoca