How do you set the colour of a set of dropdown items>

How-to
10

Fount it (Dropdown list change font - #2 by Titkov_AV):
LV_EVENT_READY

  lv_obj_add_event_cb(roller_temp, heating_ddl_cb_ready, LV_EVENT_READY, NULL);

void heating_ddl_cb_ready(lv_event_t * event)
{
  lv_obj_t * list = lv_dropdown_get_list(roller_temp); /*Get the list*/
  lv_obj_set_style_bg_color(list, lv_color_hex(MAIN_BG_COLOUR), LV_PART_MAIN);

}

Thanks @embeddedt !!