diff --git a/toonz/sources/toonzqt/docklayout.cpp b/toonz/sources/toonzqt/docklayout.cpp
index f42d1b6..b00ef35 100644
--- a/toonz/sources/toonzqt/docklayout.cpp
+++ b/toonz/sources/toonzqt/docklayout.cpp
@@ -422,9 +422,15 @@ void DockLayout::applyTransform(const QTransform &transform) {
 
 //------------------------------------------------------
 // check if the region will be with fixed width
-bool Region::checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets) {
+bool Region::checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets,
+                                        bool &fromDocking) {
   if (m_item) {
-    if (  (m_item->objectName() == "FilmStrip" && m_item->getCanFixWidth()) ||
+    if (m_item->wasFloating()) {
+      fromDocking = true;
+      m_item->clearWasFloating();
+      return false;
+    }
+    if ((m_item->objectName() == "FilmStrip" && m_item->getCanFixWidth()) ||
         m_item->objectName() == "StyleEditor") {
       widgets.push_back(m_item);
       return true;
@@ -436,7 +442,8 @@ bool Region::checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets) {
   if (m_orientation == horizontal) {
     bool ret = true;
     for (Region *childRegion : m_childList) {
-      if (!childRegion->checkWidgetsToBeFixedWidth(widgets)) ret = false;
+      if (!childRegion->checkWidgetsToBeFixedWidth(widgets, fromDocking))
+        ret = false;
     }
     return ret;
   }
@@ -444,7 +451,8 @@ bool Region::checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets) {
   else {
     bool ret = false;
     for (Region *childRegion : m_childList) {
-      if (childRegion->checkWidgetsToBeFixedWidth(widgets)) ret = true;
+      if (childRegion->checkWidgetsToBeFixedWidth(widgets, fromDocking))
+        ret = true;
     }
     return ret;
   }
@@ -464,9 +472,10 @@ void DockLayout::redistribute() {
     // check recursively from the root region, if the widgets can be fixed.
     // it avoids all widgets in horizontal alignment to be fixed, or UI becomes
     // glitchy.
+    bool fromDocking = false;
     bool widgetsCanBeFixedWidth =
-        !m_regions.front()->checkWidgetsToBeFixedWidth(widgets);
-    if (widgetsCanBeFixedWidth) {
+        !m_regions.front()->checkWidgetsToBeFixedWidth(widgets, fromDocking);
+    if (!fromDocking && widgetsCanBeFixedWidth) {
       for (QWidget *widget : widgets) widget->setFixedWidth(widget->width());
     }
 
@@ -487,7 +496,7 @@ void DockLayout::redistribute() {
     m_regions.front()->setGeometry(contentsRect());
     m_regions.front()->redistribute();
 
-    if (widgetsCanBeFixedWidth) {
+    if (!fromDocking && widgetsCanBeFixedWidth) {
       for (QWidget *widget : widgets) {
         widget->setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
         widget->setMinimumSize(0, 0);
@@ -737,7 +746,8 @@ Region *DockLayout::dockItemPrivate(DockWidget *item, Region *r, int idx) {
   item->onDock(true);
 
   item->setDockedAppearance();
-  item->m_floating = false;
+  item->m_floating    = false;
+  item->m_wasFloating = true;
 
   if (!r) {
     // Insert new root region
diff --git a/toonz/sources/toonzqt/docklayout.h b/toonz/sources/toonzqt/docklayout.h
index 6502aad..f35c68c 100644
--- a/toonz/sources/toonzqt/docklayout.h
+++ b/toonz/sources/toonzqt/docklayout.h
@@ -176,7 +176,8 @@ public:
 
 protected:
   // Private attributes for dragging purposes
-  bool m_floating;   // Whether this window is floating or docked
+  bool m_floating;  // Whether this window is floating or docked
+  bool m_wasFloating;
   bool m_dragging;   // Whether this window is being dragged
   bool m_undocking;  // Still docked, but after a mouse button press on a title
                      // bar.
@@ -220,6 +221,8 @@ public:
   DockLayout *parentLayout() const { return m_parentLayout; }
 
   bool isFloating() const { return m_floating; }
+  bool wasFloating() const { return m_wasFloating; }
+  void clearWasFloating() { m_wasFloating = false; }
   bool isMaximized() const { return m_maximized; }
 
   // Query functions
@@ -530,7 +533,8 @@ public:
 
   unsigned int find(const Region *subRegion) const;
 
-  bool checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets);
+  bool checkWidgetsToBeFixedWidth(std::vector<QWidget *> &widgets,
+                                  bool &fromDocking);
 
 private:
   // Setters - private