Change:
MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { command: { id: SPLIT_EDITOR_LEFT, title: localize('splitLeft', "Split Left") }, group: '2_split', order: 30 }); MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { command: { id: SPLIT_EDITOR_RIGHT, title: localize('splitRight', "Split Right") }, group: '2_split', order: 40 }); <del> MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { submenu: MenuId.EditorTabsBarShowTabsSubmenu, title: localize('tabBar', "Tab Bar"), group: '3_config', order: 10, when: InEditorZenModeContext.negate() }); </del> <ins> MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { command: { id: MOVE_EDITOR_GROUP_INTO_NEW_WINDOW_COMMAND_ID, title: localize('moveEditorGroupToNewWindow', "Move into New Window") }, group: '3_window', order: 10 }); MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { command: { id: COPY_EDITOR_GROUP_INTO_NEW_WINDOW_COMMAND_ID, title: localize('copyEditorGroupToNewWindow', "Copy into New Window") }, group: '3_window', order: 20 }); MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { submenu: MenuId.EditorTabsBarShowTabsSubmenu, title: localize('tabBar', "Tab Bar"), group: '4_config', order: 10, when: InEditorZenModeContext.negate() }); </ins> MenuRegistry.appendMenuItem(MenuId.EditorTabsBarShowTabsSubmenu, { command: { id: ShowMultipleEditorTabsAction.ID, title: localize('multipleTabs', "Multiple Tabs"), toggled: ContextKeyExpr.equals('config.workbench.editor.showTabs', 'multiple') }, group: '1_config', order: 10 }); MenuRegistry.appendMenuItem(MenuId.EditorTabsBarShowTabsSubmenu, { command: { id: ShowSingleEditorTabAction.ID, title: localize('singleTab', "Single Tab"), toggled: ContextKeyExpr.equals('config.workbench.editor.showTabs', 'single') }, group: '1_config', order: 20 }); MenuRegistry.appendMenuItem(MenuId.EditorTabsBarShowTabsSubmenu, { command: { id: HideEditorTabsAction.ID, title: localize('hideTabBar', "Hide"), toggled: ContextKeyExpr.equals('config.workbench.editor.showTabs', 'none') }, group: '1_config', order: 30 }); <del> MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { submenu: MenuId.EditorActionsPositionSubmenu, title: localize('editorActionsPosition', "Editor Actions Position"), group: '3_config', order: 20 }); </del> <ins> MenuRegistry.appendMenuItem(MenuId.EditorTabsBarContext, { submenu: MenuId.EditorActionsPositionSubmenu, title: localize('editorActionsPosition', "Editor Actions Position"), group: '4_config', order: 20 }); </ins> MenuRegistry.appendMenuItem(MenuId.EditorActionsPositionSubmenu, { command: { id: EditorActionsDefaultAction.ID, title: localize('tabBar', "Tab Bar"), toggled: ContextKeyExpr.equals('config.workbench.editor.editorActionsLocation', 'default') }, group: '1_config', order: 10, when: ContextKeyExpr.equals('config.workbench.editor.showTabs', 'none').negate() }); MenuRegistry.appendMenuItem(MenuId.EditorActionsPositionSubmenu, { command: { id: EditorActionsTitleBarAction.ID, title: localize('titleBar', "Title Bar"), toggled: ContextKeyExpr.or(ContextKeyExpr.equals('config.workbench.editor.editorActionsLocation', 'titleBar'), ContextKeyExpr.and(ContextKeyExpr.equals('config.workbench.editor.showTabs', 'none'), ContextKeyExpr.equals('config.workbench.editor.editorActionsLocation', 'default'))) }, group: '1_config', order: 20, when: ContextKeyExpr.equals('config.window.titleBarStyle', 'native').negate() }); MenuRegistry.appendMenuItem(MenuId.EditorActionsPositionSubmenu, { command: { id: HideEditorActionsAction.ID, title: localize('hidden', "Hidden"), toggled: ContextKeyExpr.or(ContextKeyExpr.equals('config.workbench.editor.editorActionsLocation', 'hidden'), ContextKeyExpr.and(ContextKeyExpr.equals('config.window.titleBarStyle', 'native'), ContextKeyExpr.equals('config.workbench.editor.editorActionsLocation', 'titleBar'))) }, group: '1_config', order: 30 });

Discussion:
Testing I am wondering if there should be a context menu action for this? !
Yeah, I actually decided to do a bit more: Editor Tab Container Context Menu: <img width="447" alt="image" src=""Empty Editor Group Context Menu: <img width="458" alt="image" src="" to open an empty aux window