Expected behavior

Hi, beginner user (new to bootstrap and javascript in general) with what is probably a basic question sorry.

I've downloaded the MDB5-STANDARD-UI-KIT-Pro-Essential-4.1.0 zip file, unzipped it and edited the index file.

I then went to https://mdbootstrap.com/docs/standard/plugins/filters/#docsTabsOverview and copied and pasted the "Basic example - DOM Elements" HTML code and the Javascript code into the custom scripts section.

Actual behavior

The filters do not appear to be working. Via developer options I can see that there is an error : Uncaught ReferenceError: Filters is not defined related to this line: const filtersInstance = new Filters(basicExampleFilters);

Resources (screenshots, code snippets etc.)

All the code came from the example page (Basic example - DOM Elements), is there something I'm missing or not initialising?