Hi!
Thanks for using our plugin.
You can do the following: in the Advanced tab (Extra Filter Layout), select the filter type you need, for example, Alphabetical, and place the shortcode in the right place on the page. And in the Layout tab, select the main filter type – Dropdown. This way you will get two independent filters: alphabetical and dropdown. You can do it differently: create your own custom filter using the API plugin, but this is a slightly complicated solution that requires understanding JavaScript, PHP and the functions of WordPress itself (see doc. https://github.com/YMC-22/smart-filter).
In the future, we plan to implement a multi-selection of different filter types on the page. We hope this will help you solve your problems.