So the dropdown would act like a filter for the list below?
that’s a feature highly awaited by users but not yet available. However, there’s a way to do it, but it’s only working with a limited number of items, you’ll understand why:
Using a TAB element, you can achieve a fake sorting. Each of the tab is one of your list items, and inside of each Tab Content, there’s a list. The limitation here is you can end up with a very heavy page because all the lists are loaded. And there’s a maximum of 20 lists per page.
By default the Tab Links are presented side by side. However, using the technique linked below, you can turn a Tab Links list into a dropdown list. This is a neat trick by @cpjackman.