diff --git a/ShareX.HelpersLib/Controls/TabToTreeView.Designer.cs b/ShareX.HelpersLib/Controls/TabToTreeView.Designer.cs
index 380ac0be8..e42255876 100644
--- a/ShareX.HelpersLib/Controls/TabToTreeView.Designer.cs
+++ b/ShareX.HelpersLib/Controls/TabToTreeView.Designer.cs
@@ -30,11 +30,14 @@ private void InitializeComponent()
         {
             this.tvMain = new System.Windows.Forms.TreeView();
             this.scMain = new System.Windows.Forms.SplitContainer();
+            this.pSeparator = new System.Windows.Forms.Panel();
             this.tcMain = new ShareX.HelpersLib.TablessControl();
+            this.pLeft = new System.Windows.Forms.Panel();
             ((System.ComponentModel.ISupportInitialize)(this.scMain)).BeginInit();
             this.scMain.Panel1.SuspendLayout();
             this.scMain.Panel2.SuspendLayout();
             this.scMain.SuspendLayout();
+            this.pLeft.SuspendLayout();
             this.SuspendLayout();
             // 
             // tvMain
@@ -65,8 +68,8 @@ private void InitializeComponent()
             // 
             // scMain.Panel1
             // 
-            this.scMain.Panel1.Controls.Add(this.tvMain);
-            this.scMain.Panel1.Padding = new System.Windows.Forms.Padding(8);
+            this.scMain.Panel1.Controls.Add(this.pSeparator);
+            this.scMain.Panel1.Controls.Add(this.pLeft);
             // 
             // scMain.Panel2
             // 
@@ -76,6 +79,16 @@ private void InitializeComponent()
             this.scMain.SplitterWidth = 3;
             this.scMain.TabIndex = 0;
             // 
+            // pSeparator
+            // 
+            this.pSeparator.BackColor = System.Drawing.SystemColors.ControlDark;
+            this.pSeparator.Dock = System.Windows.Forms.DockStyle.Right;
+            this.pSeparator.Location = new System.Drawing.Point(236, 0);
+            this.pSeparator.MaximumSize = new System.Drawing.Size(1, 0);
+            this.pSeparator.Name = "pSeparator";
+            this.pSeparator.Size = new System.Drawing.Size(1, 500);
+            this.pSeparator.TabIndex = 1;
+            // 
             // tcMain
             // 
             this.tcMain.Dock = System.Windows.Forms.DockStyle.Fill;
@@ -86,6 +99,16 @@ private void InitializeComponent()
             this.tcMain.TabIndex = 0;
             this.tcMain.Visible = false;
             // 
+            // pLeft
+            // 
+            this.pLeft.Controls.Add(this.tvMain);
+            this.pLeft.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.pLeft.Location = new System.Drawing.Point(0, 0);
+            this.pLeft.Name = "pLeft";
+            this.pLeft.Padding = new System.Windows.Forms.Padding(8);
+            this.pLeft.Size = new System.Drawing.Size(237, 500);
+            this.pLeft.TabIndex = 2;
+            // 
             // TabToTreeView
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
@@ -98,6 +121,7 @@ private void InitializeComponent()
             this.scMain.Panel2.ResumeLayout(false);
             ((System.ComponentModel.ISupportInitialize)(this.scMain)).EndInit();
             this.scMain.ResumeLayout(false);
+            this.pLeft.ResumeLayout(false);
             this.ResumeLayout(false);
 
         }
@@ -107,5 +131,7 @@ private void InitializeComponent()
         private System.Windows.Forms.TreeView tvMain;
         private System.Windows.Forms.SplitContainer scMain;
         private TablessControl tcMain;
+        private System.Windows.Forms.Panel pSeparator;
+        private System.Windows.Forms.Panel pLeft;
     }
 }
diff --git a/ShareX.HelpersLib/Controls/TabToTreeView.cs b/ShareX.HelpersLib/Controls/TabToTreeView.cs
index 1f98ed6b8..8bc2ac81f 100644
--- a/ShareX.HelpersLib/Controls/TabToTreeView.cs
+++ b/ShareX.HelpersLib/Controls/TabToTreeView.cs
@@ -102,11 +102,23 @@ public Color LeftPanelBackColor
             }
             set
             {
-                scMain.Panel1.BackColor = value;
+                pLeft.BackColor = value;
                 tvMain.BackColor = value;
             }
         }
 
+        public Color SeparatorColor
+        {
+            get
+            {
+                return pSeparator.BackColor;
+            }
+            set
+            {
+                pSeparator.BackColor = value;
+            }
+        }
+
         [DefaultValue(false)]
         public bool AutoSelectChild { get; set; }
 
diff --git a/ShareX.HelpersLib/ShareXResources.cs b/ShareX.HelpersLib/ShareXResources.cs
index f0b5d9975..e6a63815f 100644
--- a/ShareX.HelpersLib/ShareXResources.cs
+++ b/ShareX.HelpersLib/ShareXResources.cs
@@ -197,6 +197,7 @@ private static void ApplyCustomThemeToControl(Control control)
             {
                 case TabToTreeView tttv:
                     tttv.LeftPanelBackColor = Theme.DarkBackgroundColor;
+                    tttv.SeparatorColor = Theme.SeparatorDarkColor;
                     break;
             }
         }