“Is it possible to reinstate the open/close behaviour as per the symbol? So that all items can be closed?”
Its possible, refer to the Uikit doc https://getuikit.com/docs/accordion#component-options
Option toggle is assigned to > .uk-accordion-title by default, you can create custom css class for icon <div class="open-close">icon here</div> then adjust code for the accordion behavior liketoggle: > .open-close
