We don’t have such query parameter as “openAccordions” to open all accordions on the page, but this could be done by adding a bit of a custom code.
I have a button with attached query parameter “?action=openAccordions”:
Fliplet().then(function () { //this will run after the page is rendered
//here you can use any query parameter instead of 'openAccordions'
if (Fliplet.Navigate.query.action == 'openAccordions'){
$(document).find('.panel-group .panel').each((index, el)=> {
$(el).find('.panel-title').trigger('click');
});
}
});