1、左边：
示例代码：
CDockManager::setConfigFlags(CDockManager::DefaultOpaqueConfig);
CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
dockManager = new CDockManager(this);
// Disabling the Internal Style Sheet
dockManager->setStyleSheet("");
auto previewDockWidget = new CDockWidget("preview", dockManager);
auto editWidget = new EditWidget(this);
previewDockWidget->setWidget(editWidget);
dockManager->addDockWidget(ads::LeftDockWidgetArea, previewDockWidget);
auto previewDockWidget1 = new CDockWidget("preview111", dockManager);
auto editWidget1 = new EditWidget1(this);
previewDockWidget1->setWidget(editWidget1);
dockManager->addDockWidget(ads::LeftDockWidgetArea, previewDockWidget1);
auto previewDockWidget2 = new CDockWidget("preview112", dockManager);
auto editWidget2 = new EditWidget2(this);
previewDockWidget2->setWidget(editWidget2);
dockManager->addDockWidget(ads::LeftDockWidgetArea, previewDockWidget2);
2、左边：
CDockManager::setConfigFlags(CDockManager::DefaultOpaqueConfig);
CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
dockManager = new CDockManager(this);
// Disabling the Internal Style Sheet
dockManager->setStyleSheet("");
auto previewDockWidget = new CDockWidget("preview", dockManager);
auto editWidget = new EditWidget(this);
previewDockWidget->setWidget(editWidget);
dockManager->addDockWidget(ads::TopDockWidgetArea, previewDockWidget);
auto previewDockWidget1 = new CDockWidget("preview111", dockManager);
auto editWidget1 = new EditWidget1(this);
previewDockWidget1->setWidget(editWidget1);
dockManager->addDockWidget(ads::TopDockWidgetArea, previewDockWidget1);
auto previewDockWidget2 = new CDockWidget("preview112", dockManager);
auto editWidget2 = new EditWidget2(this);
previewDockWidget2->setWidget(editWidget2);
dockManager->addDockWidget(ads::TopDockWidgetArea, previewDockWidget2);