Small layout improvement

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

@@ -1,10 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:padding="24dp">
 
+    <TextView
+        android:id="@+id/tvCaption"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/title_setup_theme"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ScrollView
+        android:id="@+id/scroll"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/tvCaption">
+
         <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content">
@@ -80,6 +98,8 @@
                     android:text="@string/title_setup_grey_system_theme"
                     android:textAppearance="@style/TextAppearance.AppCompat.Medium" />
             </RadioGroup>
+        </androidx.constraintlayout.widget.ConstraintLayout>
+    </ScrollView>
 
     <TextView
         android:id="@+id/tvSystem"
@@ -90,6 +110,5 @@
         android:textAppearance="@style/TextAppearance.AppCompat.Small"
         android:textStyle="italic"
         app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/rgTheme" />
+        app:layout_constraintTop_toBottomOf="@id/scroll" />
-    </androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
-</ScrollView>