In Android Studio how to view what goes off-screen?

I am using text and an image with this they exit off the screen but with ScrollView is possible candle but in Android Studio on the screen is the cell phone to follow the design what comes out screen you do not see it, I would like to pull the screen up Android Studio to be able to observe and put some buttons

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/scrollView">
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Texto"
        android:id="@+id/textView" />

        </LinearLayout>

            <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <ImageView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/f1" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <ImageView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@drawable/f1" />
            </LinearLayout>




        </LinearLayout>
    </ScrollView>
</RelativeLayout>