How to use the @theia/workspace/lib/browser.WorkspaceCommands.REMOVE_FOLDER function in @theia/workspace

private updateAddRemoveFolderActions(registry: MenuModelRegistry): void {
        this.toDisposeAddRemoveFolderActions.dispose();
        if (this.workspacePreferences['workspace.supportMultiRootWorkspace']) {
            this.toDisposeAddRemoveFolderActions.push(registry.registerMenuAction(NavigatorContextMenu.WORKSPACE, {
                commandId: FileNavigatorCommands.ADD_ROOT_FOLDER.id,
                label: WorkspaceCommands.ADD_FOLDER.label!
            }));
            this.toDisposeAddRemoveFolderActions.push(registry.registerMenuAction(NavigatorContextMenu.WORKSPACE, {
                commandId: WorkspaceCommands.REMOVE_FOLDER.id
            }));
        }
    }