/* Paste the following line as your title for the accordion tab */
Read <span class="read-more">More</span><span class="read-less">Less</span>


/* CSS */
/* Put this somewhere central like Site Settings > Custom CSS */
.text-expander .e-n-accordion-item span.read-less {
    display: none;
}

.text-expander.elementor-widget-n-accordion .e-n-accordion-item[open] .e-n-accordion-item-title span.read-more {
    display: none;
}
.text-expander.elementor-widget-n-accordion .e-n-accordion-item[open] .e-n-accordion-item-title span.read-less {
    display: inline;
}