diff --git a/toonz/sources/toonz/mainwindow.cpp b/toonz/sources/toonz/mainwindow.cpp
index 6509a226..33dff193 100644
--- a/toonz/sources/toonz/mainwindow.cpp
+++ b/toonz/sources/toonz/mainwindow.cpp
@@ -2273,6 +2273,8 @@ void MainWindow::defineActions() {
 
   createMenuWindowsAction(MI_OpenFileBrowser, QT_TR_NOOP("&File Browser"), "",
                          "filebrowser");
+  createMenuWindowsAction(MI_OpenPreproductionBoard, QT_TR_NOOP("&Preproduction Board"), "",
+                          "scenebrowser");
   createMenuWindowsAction(MI_OpenFileViewer, QT_TR_NOOP("&Flipbook"), "",
                          "flipbook");
   createMenuWindowsAction(MI_OpenFunctionEditor, QT_TR_NOOP("&Function Editor"),
diff --git a/toonz/sources/toonz/scenebrowser.cpp b/toonz/sources/toonz/scenebrowser.cpp
index 14a45636..d591259f 100644
--- a/toonz/sources/toonz/scenebrowser.cpp
+++ b/toonz/sources/toonz/scenebrowser.cpp
@@ -103,12 +103,6 @@ QMutex levelFileMutex;
 
 }  // namespace
 
-inline bool isMultipleFrameType(std::string type) {
-  return (type == "tlv" || type == "tzl" || type == "pli" || type == "mov" ||
-          type == "avi" || type == "3gp" || type == "gif" || type == "mp4" ||
-          type == "webm");
-}
-
 //=============================================================================
 //
 // SceneBrowserButtonBar