.wp-block-sht-timetable-timing {
  display: none;
}
.wp-block-sht-timetable-timing--on {
  display: block;
}

.wp-block-column:has(> .wp-block-sht-timetable-timing:not(.wp-block-sht-timetable-timing--on):first-child:last-child) {
  display: none;
}

.editor-styles-wrapper .wp-block-sht-timetable-timing {
  display: block;
}