diff --git a/app/src/main/java/com/lhw/pdf/MainActivity.kt b/app/src/main/java/com/lhw/pdf/MainActivity.kt
index 5ebca8c..335efdd 100644
--- a/app/src/main/java/com/lhw/pdf/MainActivity.kt
+++ b/app/src/main/java/com/lhw/pdf/MainActivity.kt
@@ -36,6 +36,7 @@ class MainActivity : AppCompatActivity() {
     private var presentation: MyPresentation? = null
     private lateinit var pdfDocument: PdfDocument
     private val showPages = mutableListOf<Boolean>()
+    private val thumbnailImageViews = mutableListOf<ImageView>()
     private val defaultCachedFileName = "cached.pdf"
 
     private fun inputStreamToCache(outputFilename: String, inputStream: InputStream): File {
@@ -73,6 +74,17 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
+    private fun reLayoutThumbnails() {
+        val container = binding.appBarMain.contentMain.thumbnailsLayout
+        val disabledContainer = binding.appBarMain.contentMain.thumbnailsDisabledLayout
+        container.removeAllViewsInLayout()
+        disabledContainer.removeAllViewsInLayout()
+        showPages.map { if (it) container else disabledContainer }.zip(thumbnailImageViews).forEach { (cont, img) ->
+            cont.addView(img)
+        }
+        updatePresentationImages(false)
+    }
+
     private fun populateThumbnails() {
         val container = binding.appBarMain.contentMain.thumbnailsLayout
         for ((index, bitmap) in pdfDocument.bitmapThumbnails) {
@@ -80,12 +92,13 @@ class MainActivity : AppCompatActivity() {
             img.setImageBitmap(bitmap)
             img.setOnClickListener {
                 showPages[index] = !showPages[index]
-                img.setColorFilter(if (showPages[index]) 0 else 0x7F000000, PorterDuff.Mode.DARKEN)
-                updatePresentationImages(false)
+                //img.setColorFilter(if (showPages[index]) 0 else 0x7F000000, PorterDuff.Mode.DARKEN)
+                reLayoutThumbnails()
             }
-            container.addView(img)
+            thumbnailImageViews.add(img)
             showPages.add(true)
         }
+        reLayoutThumbnails()
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -109,8 +122,8 @@ class MainActivity : AppCompatActivity() {
         handleIntent(intent)
 
         pdfDocument.renderThumbnails(thumbnailWidth, thumbnailHeight)
-        populateThumbnails()
         makePresentationView()
+        populateThumbnails()
 
         val container = binding.appBarMain.contentMain.thumbnailsLayout
         val containerScroll = binding.appBarMain.contentMain.thumbnailsScroll
diff --git a/app/src/main/res/layout/content_main.xml b/app/src/main/res/layout/content_main.xml
index 5fbb131..c1892e8 100644
--- a/app/src/main/res/layout/content_main.xml
+++ b/app/src/main/res/layout/content_main.xml
@@ -18,10 +18,30 @@
         app:layout_constraintTop_toTopOf="parent"
         app:navGraph="@navigation/mobile_navigation" />
 
+    <HorizontalScrollView
+        android:id="@+id/thumbnails_disabled_scroll"
+        android:layout_width="0dp"
+        android:layout_height="300dp"
+        android:background="#80C01010"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.0">
+
+        <LinearLayout
+            android:id="@+id/thumbnails_disabled_layout"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:orientation="horizontal"
+            tools:showIn="@layout/content_main" />
+    </HorizontalScrollView>
+
     <HorizontalScrollView
         android:id="@+id/thumbnails_scroll"
         android:layout_width="0dp"
         android:layout_height="0dp"
+        android:layout_marginTop="300dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"