diff --git a/include/sfx2/thumbnailview.hxx b/include/sfx2/thumbnailview.hxx
index fe4196f44519..70260a5bfd1a 100644
--- a/include/sfx2/thumbnailview.hxx
+++ b/include/sfx2/thumbnailview.hxx
@@ -303,12 +303,15 @@ protected:
     tools::Long mnVItemSpace;          // Vertical spacing between rows, -1 to use excess unused height split up between items
     tools::Long mnVisLines;
     tools::Long mnLines;
+    tools::Long mnPinnedSeparatorY;      // tdf#38742 - vertical position of the separator line between pinned/unpinned items
+    tools::Long mnPinnedSeparatorMargin; // tdf#38742 - horizontal margin of the pinned separator
 
     sal_uInt16 mnCols;
     sal_uInt16 mnFirstLine;
     bool mbScroll : 1;          // Whether we need to scroll
     bool mbAllowVScrollBar : 1; // Whether to show a visible scrollbar
     bool mbHasVisibleItems : 1;
+    bool mbHasPinnedSeparator : 1; // tdf#38742 - whether to draw a separator line after the pinned items
     bool mbShowTooltips : 1;
     bool mbDrawMnemonics : 1;
     bool mbSelectOnFocus : 1;
diff --git a/sfx2/source/control/thumbnailview.cxx b/sfx2/source/control/thumbnailview.cxx
index bd983abbd97f..6ca8a550536d 100644
--- a/sfx2/source/control/thumbnailview.cxx
+++ b/sfx2/source/control/thumbnailview.cxx
@@ -283,8 +283,11 @@ void ThumbnailView::ImplInit()
     mnLines = 0;
     mnFirstLine = 0;
     mnCols = 0;
+    mnPinnedSeparatorY = 0;
+    mnPinnedSeparatorMargin = 0;
     mbScroll = false;
     mbHasVisibleItems = false;
+    mbHasPinnedSeparator = false;
     mbShowTooltips = false;
     mbDrawMnemonics = false;
     mbAllowMultiSelection = true;
@@ -526,6 +529,16 @@ void ThumbnailView::CalculateItemPositions(bool bScrollBarUsed)
         y += mnItemHeight + nVItemSpace;
     }
 
+    // tdf#38742 - calculate the position for the separator line between pinned/unpinned items
+    mbHasPinnedSeparator = nCurCountVisible && nItemCountPinned < nItemCount;
+    if (mbHasPinnedSeparator)
+    {
+        // separator line is drawn at the center above the first unpinned row
+        mnPinnedSeparatorY = y - nVItemSpace / 2;
+        // separator line is aligned with the first and last document thumbnails in the row
+        mnPinnedSeparatorMargin = nStartX;
+    }
+
     // tdf#164102 - adjust first item only if there are any pinned items
     if (const auto nRemainingPinnedSlots = nItemCountPinned % mnCols)
     {
@@ -980,6 +993,16 @@ void ThumbnailView::Paint(vcl::RenderContext& rRenderContext, const ::tools::Rec
             continue;
         pItem->Paint(pProcessor.get(), *mpItemAttrs);
     }
+
+    // tdf#38742 - draw a separator line between the pinned/unpinned items using left/right margin
+    if (mbHasPinnedSeparator)
+    {
+        rRenderContext.SetLineColor(
+            rRenderContext.GetSettings().GetStyleSettings().GetSeparatorColor());
+        rRenderContext.DrawLine(
+            Point(mnPinnedSeparatorMargin, mnPinnedSeparatorY),
+            Point(GetOutputSizePixel().Width() - mnPinnedSeparatorMargin, mnPinnedSeparatorY));
+    }
 }
 
 void ThumbnailView::GetFocus()