You may notice that some posts have a "What to read next" section. It contains a Loop Carousel with posts. Check the instructions below for editing its query.
The Loop Builder enables you to create and design the main item for repeating content (i.e. loops) such as listings and customize its layout on the page. By creating a main item template yourself, you get much more flexibility compared to the Posts widget to design your listings and include additional dynamic content. Read these articles for all the details:
https://elementor.com/blog/introducing-the-loop-builder/
https://elementor.com/help/how-do-i-build-a-loop-grid/
The "What to read next" section is accessible in the "Blog - Single Post" template:
Edit the template with Elementor > Locate the Loop Carousel widget > Open the Query tab, and edit the source, order, etc.