diff --git a/nw/gui/elements/doceditor.py b/nw/gui/elements/doceditor.py
index db15998c..404f8d75 100644
--- a/nw/gui/elements/doceditor.py
+++ b/nw/gui/elements/doceditor.py
@@ -21,7 +21,7 @@ from PyQt5.QtWidgets import (
 )
 from PyQt5.QtGui import (
     QTextCursor, QTextOption, QIcon, QKeySequence, QFont, QColor,
-    QPalette, QTextDocument,
+    QPalette, QTextDocument
 )
 
 from nw.project import NWDoc
@@ -185,7 +185,6 @@ class GuiDocEditor(QTextEdit):
             tHandle = self.theHandle
             self.clearEditor()
             self.loadText(tHandle)
-            self.changeWidth()
         else:
             self.clearEditor()
 
@@ -298,11 +297,13 @@ class GuiDocEditor(QTextEdit):
     #  General Class Methods
     ##
 
-    def changeWidth(self):
+    def resizeEvent(self, theEvent):
         """Automatically adjust the margins so the text is centred, but
         only if Config.textFixedW is set to True.
         """
-        if self.mainConf.textFixedW:
+        QTextEdit.resizeEvent(self, theEvent)
+
+        if self.mainConf.textFixedW or self.theParent.isZenMode:
             vBar = self.verticalScrollBar()
             if vBar.isVisible():
                 sW = vBar.width()
@@ -313,10 +314,13 @@ class GuiDocEditor(QTextEdit):
             tM = int((wW - sW - tW)/2)
             if tM < self.mainConf.textMargin:
                 tM = self.mainConf.textMargin
-            docFormat = self.qDocument.rootFrame().frameFormat()
-            docFormat.setLeftMargin(tM)
-            docFormat.setRightMargin(tM)
-            self.qDocument.rootFrame().setFrameFormat(docFormat)
+        else:
+            tM = self.mainConf.textMargin
+
+        docFormat = self.qDocument.rootFrame().frameFormat()
+        docFormat.setLeftMargin(tM)
+        docFormat.setRightMargin(tM)
+        self.qDocument.rootFrame().setFrameFormat(docFormat)
 
         return
 
diff --git a/nw/gui/icons.py b/nw/gui/icons.py
index 34b9f529..88149b6e 100644
--- a/nw/gui/icons.py
+++ b/nw/gui/icons.py
@@ -46,7 +46,7 @@ class GuiIcons:
 
     DECO_MAP = {
         "export"   : "export.svg",
-        "settings" : "settings.svg",
+        "settings" : "gear.svg",
     }
 
     def __init__(self, theParent):
diff --git a/nw/gui/mainmenu.py b/nw/gui/mainmenu.py
index 1e935d68..65a0a8d3 100644
--- a/nw/gui/mainmenu.py
+++ b/nw/gui/mainmenu.py
@@ -410,6 +410,18 @@ class GuiMainMenu(QMenuBar):
         # View > Separator
         self.viewMenu.addSeparator()
 
+        # View > Toggle Zen Mode
+        menuItem = QAction("Zen Mode", self)
+        menuItem.setStatusTip("Toggles zen mode, only showing text editor")
+        menuItem.setShortcut("F8")
+        menuItem.setCheckable(True)
+        menuItem.setChecked(self.theParent.isZenMode)
+        menuItem.toggled.connect(self.theParent.toggleZenMode)
+        self.viewMenu.addAction(menuItem)
+
+        # View > Separator
+        self.viewMenu.addSeparator()
+
         # View > Project Timeline
         menuItem = QAction("Show Project Timeline", self)
         menuItem.setStatusTip("Open the project timeline window")
diff --git a/nw/guimain.py b/nw/guimain.py
index 169fa42f..551b9c8e 100644
--- a/nw/guimain.py
+++ b/nw/guimain.py
@@ -47,6 +47,7 @@ class GuiMain(QMainWindow):
         self.theProject = NWProject(self)
         self.theIndex   = NWIndex(self.theProject, self)
         self.hasProject = False
+        self.isZenMode  = False
 
         logger.info("OS: %s" % (
             self.mainConf.osType)
@@ -107,14 +108,12 @@ class GuiMain(QMainWindow):
         self.splitView = QSplitter(Qt.Horizontal)
         self.splitView.addWidget(self.editPane)
         self.splitView.addWidget(self.viewPane)
-        self.splitView.splitterMoved.connect(self._splitViewMove)
 
         self.splitMain = QSplitter(Qt.Horizontal)
         self.splitMain.setContentsMargins(4,4,4,4)
         self.splitMain.addWidget(self.treePane)
         self.splitMain.addWidget(self.splitView)
         self.splitMain.setSizes(self.mainConf.mainPanePos)
-        self.splitMain.splitterMoved.connect(self._splitMainMove)
 
         self.setCentralWidget(self.splitMain)
 
@@ -359,7 +358,6 @@ class GuiMain(QMainWindow):
             self.closeDocument()
             if self.docEditor.loadText(tHandle):
                 self.docEditor.setFocus()
-                self.docEditor.changeWidth()
                 self.theProject.setLastEdited(tHandle)
             else:
                 return False
@@ -391,7 +389,6 @@ class GuiMain(QMainWindow):
             vPos[0] = int(bPos[1]/2)
             vPos[1] = bPos[1]-vPos[0]
             self.splitView.setSizes(vPos)
-            self.docEditor.changeWidth()
 
         return True
 
@@ -698,9 +695,25 @@ class GuiMain(QMainWindow):
         self.viewPane.setVisible(False)
         vPos = [bPos[1],0]
         self.splitView.setSizes(vPos)
-        self.docEditor.changeWidth()
         return not self.viewPane.isVisible()
 
+    def toggleZenMode(self):
+        """Main GUI Zen Mode hides tree, view pane and optionally also
+        statusbar and menu.
+        """
+
+        self.isZenMode = not self.isZenMode
+        if self.isZenMode:
+            logger.debug("Activating Zen Mode")
+        else:
+            logger.debug("Deactivating Zen Mode")
+
+        isVisible = not self.isZenMode
+        self.viewPane.setVisible(isVisible)
+        self.treePane.setVisible(isVisible)
+
+        return
+
     ##
     #  Internal Functions
     ##
@@ -745,14 +758,6 @@ class GuiMain(QMainWindow):
     #  Events
     ##
 
-    def resizeEvent(self, theEvent):
-        """Extend QMainWindow.resizeEvent to signal dependent GUI
-        elements that its pane may have changed size.
-        """
-        QMainWindow.resizeEvent(self,theEvent)
-        self.docEditor.changeWidth()
-        return
-
     def closeEvent(self, theEvent):
         if self.closeMain():
             theEvent.accept()
@@ -801,18 +806,4 @@ class GuiMain(QMainWindow):
             return
         return
 
-    def _splitMainMove(self, pWidth, pHeight):
-        """Alert dependent GUI elements that the main pane splitter has
-        been moved.
-        """
-        self.docEditor.changeWidth()
-        return
-
-    def _splitViewMove(self, pWidth, pHeight):
-        """Alert dependent GUI elements that the edit/view pane splitter
-        has been moved.
-        """
-        self.docEditor.changeWidth()
-        return
-
 # END Class GuiMain