Flight Engineer displayability also takes into account the main canvas enabled state (hides on F2).
Flight Engineer displayability also takes into account the main canvas enabled state (hides on F2).

--- a/KerbalEngineer/Flight/DisplayStack.cs
+++ b/KerbalEngineer/Flight/DisplayStack.cs
@@ -121,7 +121,6 @@
             try
             {
                 this.Save();
-                RenderingManager.RemoveFromPostDrawQueue(0, this.Draw);
             }
             catch (Exception ex)
             {
@@ -140,7 +139,6 @@
                 this.windowId = this.GetHashCode();
                 this.InitialiseStyles();
                 this.Load();
-                RenderingManager.AddToPostDrawQueue(0, this.Draw);
                 Logger.Log("ActionMenu->Start");
             }
             catch (Exception ex)
@@ -176,7 +174,7 @@
         /// <summary>
         ///     Called to draw the display stack when the UI is enabled.
         /// </summary>
-        private void Draw()
+        private void OnGUI()
         {
             try
             {

--- a/KerbalEngineer/Flight/FlightEngineerCore.cs
+++ b/KerbalEngineer/Flight/FlightEngineerCore.cs
@@ -113,6 +113,11 @@
         {
             get
             {
+                if (MainCanvasUtil.MainCanvas.enabled == false)
+                {
+                    return false;
+                }
+
                 if (isCareerMode)
                 {
                     if (isKerbalLimited && FlightGlobals.ActiveVessel.GetVesselCrew().Exists(c => c.experienceTrait.TypeName == "Engineer"))