I would like to add the Zoom function (with bookmarks) - that I see in several Shortlist style storymaps - such as the San Diego Shortlist. However - I do not see that function in the builder - and I can not find any details in the FAQs or tour of this storymap. Is this a customized tool? Or some easily configurable setting? The tool I am looking for is the upper right corner of the map as shown below.