Currently we do not offer that functionality for the sidebar. The open and closing of components without navigating into the nested components is only available for the form only. The reason we choose to not include it yet is due to the limitation of space and usability.

Let us know if you want that feature to come to the visual compose mode too; Please also include some ideas on how that could work with multiple depths of nesting. We're working hard on improving Storyblok with your feature ideas and recommendations - feel free to send us your idea for this with our feature request form here.