diff --git a/toonz/sources/toonz/sceneviewerevents.cpp b/toonz/sources/toonz/sceneviewerevents.cpp
index fdc7b84..088b7eb 100644
--- a/toonz/sources/toonz/sceneviewerevents.cpp
+++ b/toonz/sources/toonz/sceneviewerevents.cpp
@@ -16,6 +16,7 @@
 #include "comboviewerpane.h"
 #include "locatorpopup.h"
 #include "cellselection.h"
+#include "styleshortcutswitchablepanel.h"
 
 #if defined(x64)
 #include "stopmotion.h"
@@ -1418,6 +1419,15 @@ void SceneViewer::keyPressEvent(QKeyEvent *event) {
            event->modifiers() == Qt::KeypadModifier) &&
           ((Qt::Key_0 <= key && key <= Qt::Key_9) || key == Qt::Key_Tab ||
            key == Qt::Key_Backtab)) {
+        // When the viewer is in full screen mode, directly call the style
+        // shortcut function since the viewer is retrieved from the parent
+        // panel.
+        if (parentWidget() &&
+            parentWidget()->windowState() & Qt::WindowFullScreen) {
+          StyleShortcutSwitchablePanel::onKeyPress(event);
+          return true;
+        }
+
         event->ignore();
         return true;
       }
diff --git a/toonz/sources/toonz/styleshortcutswitchablepanel.cpp b/toonz/sources/toonz/styleshortcutswitchablepanel.cpp
index 2ad3607..5e77f31 100644
--- a/toonz/sources/toonz/styleshortcutswitchablepanel.cpp
+++ b/toonz/sources/toonz/styleshortcutswitchablepanel.cpp
@@ -21,7 +21,7 @@
 
 //-----------------------------------------------------------------------------
 
-void StyleShortcutSwitchablePanel::keyPressEvent(QKeyEvent *event) {
+void StyleShortcutSwitchablePanel::onKeyPress(QKeyEvent *event) {
   if (!Preferences::instance()->isUseNumpadForSwitchingStylesEnabled()) return;
   TTool *tool = TApp::instance()->getCurrentTool()->getTool();
   if (!tool) return;
@@ -57,6 +57,11 @@ void StyleShortcutSwitchablePanel::keyPressEvent(QKeyEvent *event) {
     event->accept();
   }
 }
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::keyPressEvent(QKeyEvent *event) {
+  StyleShortcutSwitchablePanel::onKeyPress(event);
+}
 
 //-----------------------------------------------------------------------------
 
diff --git a/toonz/sources/toonz/styleshortcutswitchablepanel.h b/toonz/sources/toonz/styleshortcutswitchablepanel.h
index ce68933..3867fc9 100644
--- a/toonz/sources/toonz/styleshortcutswitchablepanel.h
+++ b/toonz/sources/toonz/styleshortcutswitchablepanel.h
@@ -26,6 +26,8 @@ public:
       TDockWidget::Orientation orientation = TDockWidget::vertical)
       : TPanel(parent, flags, orientation) {}
 
+  static void onKeyPress(QKeyEvent *event);
+
 protected:
   void keyPressEvent(QKeyEvent *event) override;
   void showEvent(QShowEvent *) override;