Hi, i need the tabs to be collapsible. 
Down to the very right you can find the following text: “Enter The Active tab number you want show open by default on load”. If I put this to zero, all tabs are closed. But once opened, they cannot be closed again. At least one tab stays open. This is a nuisance as they take up too much space. 
So, i would like to add a plus sign (+) to be clickable for opening a tab and when open, a minus sign (-) to show that it can be closed again.