Create a Search & Filter Query (+ Fields)
Head to wp-admin
-> Search & Filter
-> Queries
-> Add New
to create a query.
Ensure Location is set to Dynamic and that Query is set to Dynamic.ooo – Dynamic Content for Elementor:

Create Fields
Once you’ve created your query, you can add create Fields below to be used later for filtering. Check the Elementor Documentation for more information.
Add the Dynamic Posts or Maps widget to a page
From the Elementor Editor, add your Dynamic Posts or Maps widgets to the page:

Set the Query to your Search & Filter Query
In the Dynamic Posts (or Maps) panel, set the Query to use Search & Filter then choose your query from the dropdown.

Add Search & Filter fields to your page
Use the Search & Filter Field widget to add your fields to your page.

That’s it, you’re good to go!