diff --git a/oscar/Graphs/gFlagsLine.cpp b/oscar/Graphs/gFlagsLine.cpp
index f3aab8a2..1713b169 100644
--- a/oscar/Graphs/gFlagsLine.cpp
+++ b/oscar/Graphs/gFlagsLine.cpp
@@ -231,7 +231,7 @@ void gFlagsGroup::paint(QPainter &painter, gGraph &g, const QRegion &region)
     }
 
     // graph each session at top
-    if (m_sessions.size()>1 ) {
+    if ( AppSetting->eventFlagSessionBar() && m_sessions.size()>1 ) {
         QRect sessBox(0,g.top,0,sessionBarHeight());
         double adjustment = width/(double)m_duration;
         for (const auto & sess : m_sessions) {
diff --git a/oscar/SleepLib/appsettings.cpp b/oscar/SleepLib/appsettings.cpp
index 26af4018..f6699ca1 100644
--- a/oscar/SleepLib/appsettings.cpp
+++ b/oscar/SleepLib/appsettings.cpp
@@ -27,6 +27,7 @@ AppWideSetting::AppWideSetting(Preferences *pref) : PrefSettings(pref)
 //    initPref(STR_AS_GraphSnapshots, true);
     initPref(STR_AS_IncludeSerial, false);
     initPref(STR_AS_MonochromePrinting, false);
+    initPref(STR_AS_EventFlagSessionBar, true);
     initPref(STR_AS_ShowPieChart, false);
     m_animations = initPref(STR_AS_Animations, true).toBool();
     m_squareWavePlots = initPref(STR_AS_SquareWave, false).toBool();
diff --git a/oscar/SleepLib/appsettings.h b/oscar/SleepLib/appsettings.h
index 9146db40..0a11a2b7 100644
--- a/oscar/SleepLib/appsettings.h
+++ b/oscar/SleepLib/appsettings.h
@@ -46,6 +46,7 @@ const QString STR_AS_UsePixmapCaching = "UsePixmapCaching";
 const QString STR_AS_AllowYAxisScaling = "AllowYAxisScaling";
 const QString STR_AS_IncludeSerial = "IncludeSerial";
 const QString STR_AS_MonochromePrinting = "PrintBW";
+const QString STR_AS_EventFlagSessionBar = "EventFlagSessionBar";
 const QString STR_AS_GraphTooltips = "GraphTooltips";
 const QString STR_AS_LineThickness = "LineThickness";
 const QString STR_AS_LineCursorMode = "LineCursorMode";
@@ -137,6 +138,7 @@ public:
   bool includeSerial() const { return getPref(STR_AS_IncludeSerial).toBool(); }
   //! \brief Whether to print reports in black and white, which can be more legible on non-color printers
   bool monochromePrinting() const { return getPref(STR_AS_MonochromePrinting).toBool(); }
+  bool eventFlagSessionBar() const { return getPref(STR_AS_EventFlagSessionBar).toBool(); }
   //! \Allow disabling of sessions
   //! \brief Whether to show graph tooltips
   inline bool graphTooltips() const { return m_graphTooltips; }
@@ -197,6 +199,7 @@ public:
   void setIncludeSerial(bool b) { setPref(STR_AS_IncludeSerial, b); }
   //! \brief Sets whether to print reports in black and white, which can be more legible on non-color printers
   void setMonochromePrinting(bool b) { setPref(STR_AS_MonochromePrinting, b); }
+  void setEventFlagSessionBar(bool b) { setPref(STR_AS_EventFlagSessionBar, b); }
   //! \brief Sets whether to allow double clicking on Y-Axis labels to change vertical scaling mode
   void setGraphTooltips(bool b) { setPref(STR_AS_GraphTooltips, m_graphTooltips=b); }
   //! \brief Sets the type of overlay flags (which are displayed over the Flow Waveform)
diff --git a/oscar/preferencesdialog.cpp b/oscar/preferencesdialog.cpp
index fcc8b1b4..697d60a2 100644
--- a/oscar/preferencesdialog.cpp
+++ b/oscar/preferencesdialog.cpp
@@ -241,6 +241,7 @@ PreferencesDialog::PreferencesDialog(QWidget *parent, Profile *_profile) :
     ui->allowYAxisScaling->setChecked(AppSetting->allowYAxisScaling());
     ui->includeSerial->setChecked(AppSetting->includeSerial());
     ui->monochromePrinting->setChecked(AppSetting->monochromePrinting());
+    ui->eventFlagSessionBar->setChecked(AppSetting->eventFlagSessionBar());
     ui->complianceHours->setValue(profile->cpap->complianceHours());
     ui->clinicalMode->setChecked(profile->cpap->clinicalMode());
     ui->clinicalTextEdit->setPlainText(clinicalHelp());
@@ -857,6 +858,7 @@ bool PreferencesDialog::Save()
     AppSetting->setAllowYAxisScaling(ui->allowYAxisScaling->isChecked());
     AppSetting->setIncludeSerial(ui->includeSerial->isChecked());
     AppSetting->setMonochromePrinting(ui->monochromePrinting->isChecked());
+    AppSetting->setEventFlagSessionBar(ui->eventFlagSessionBar->isChecked());
     p_profile->cpap->setClinicalMode(ui->clinicalMode->isChecked());
     AppSetting->setGraphTooltips(ui->graphTooltips->isChecked());
 
diff --git a/oscar/preferencesdialog.ui b/oscar/preferencesdialog.ui
index 243c2512..4e206e8d 100644
--- a/oscar/preferencesdialog.ui
+++ b/oscar/preferencesdialog.ui
@@ -2887,6 +2887,16 @@ Try it and see if you like it.</string>
                  </property>
                 </widget>
                </item>
+               <item>
+                <widget class="QCheckBox" name="eventFlagSessionBar">
+                 <property name="toolTip">
+                  <string>For multiple sessions, displays a thin gray line for each session at the top of the Event Flag graph.</string>
+                 </property>
+                 <property name="text">
+                  <string>Enables SessionBar in Event Flags Graph</string>
+                 </property>
+                </widget>
+               </item>
                <item>
                 <spacer name="verticalSpacer">
                  <property name="orientation">