diff --git a/src/cantor.h b/src/cantor.h
--- a/src/cantor.h
+++ b/src/cantor.h
@@ -106,6 +106,7 @@
     KParts::ReadWritePart* findPart(QWidget* widget);
 
 private:
+    QMap<KParts::ReadWritePart*, QMap<QString, bool>> m_pluginsVisibilityMap;
     QList<KParts::ReadWritePart *> m_parts;
     KParts::ReadWritePart* m_part;
     QTabWidget* m_tabWidget;
diff --git a/src/cantor.cpp b/src/cantor.cpp
--- a/src/cantor.cpp
+++ b/src/cantor.cpp
@@ -318,7 +318,20 @@
 void CantorShell::activateWorksheet(int index)
 {
     QObject* pluginHandler=m_part->findChild<QObject*>(QLatin1String("PanelPluginHandler"));
-    disconnect(pluginHandler,SIGNAL(pluginsChanged()), this, SLOT(updatePanel()));
+    if (pluginHandler)
+        disconnect(pluginHandler,SIGNAL(pluginsChanged()), this, SLOT(updatePanel()));
+
+    // Save part state before change worksheet
+    if (m_part)
+    {
+        QMap<QString, bool> visiblePanelNames;
+        foreach (QDockWidget* doc, m_panels)
+        {
+            if (doc->widget())
+                visiblePanelNames[doc->objectName()] = doc->widget()->isVisible();
+        }
+        m_pluginsVisibilityMap[m_part] = visiblePanelNames;
+    }
 
     m_part=findPart(m_tabWidget->widget(index));
     if(m_part)
@@ -378,15 +391,16 @@
         if(part)
         {
             m_parts.removeAll(part);
+            m_pluginsVisibilityMap.remove(part);
             delete part;
         }
     }
 }
 
 bool CantorShell::reallyClose(bool checkAllParts) {
     if(checkAllParts && m_parts.count() > 1) {
         bool modified = false;
-         foreach( KParts::ReadWritePart* const part, m_parts)
+        foreach( KParts::ReadWritePart* const part, m_parts)
         {
             if(part->isModified()) {
                 modified = true;
@@ -543,6 +557,7 @@
     QDockWidget* last=nullptr;
 
     QList<Cantor::PanelPlugin*> plugins=handler->plugins();
+    const QMap<QString, bool>& visiblePanelNames = m_pluginsVisibilityMap.value(m_part);
     foreach(Cantor::PanelPlugin* plugin, plugins)
     {
         if(plugin==nullptr)
@@ -559,6 +574,15 @@
         docker->setWidget(plugin->widget());
         addDockWidget ( Qt::RightDockWidgetArea,  docker );
 
+        // Set visibility for dock from saved info
+        if (visiblePanelNames.contains(plugin->name()))
+            if (visiblePanelNames[plugin->name()])
+                docker->show();
+            else
+                docker->hide();
+        else
+            docker->show();
+
         if(last!=nullptr)
             tabifyDockWidget(last, docker);
         last=docker;