Small layout improvement

app/src/main/res/layout/fragment_options_notifications.xml

@@ -26,9 +26,12 @@
 
         <Button
             android:id="@+id/btnManage"
+            style="?android:attr/buttonStyleSmall"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="12dp"
+            android:minWidth="0dp"
+            android:minHeight="0dp"
             android:text="@string/title_advanced_notifications"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvAdvancedHint" />