The Loop Builder enables you to create and design the main item for repeating content (i.e. loops) such as listings, as well as customize its layout on the page. By creating a main item template yourself, you get a lot more flexibility compared to the Posts widget to design your listings and include additional dynamic content. Read these articles for all details:
https://elementor.com/blog/introducing-the-loop-builder/
https://elementor.com/help/how-do-i-build-a-loop-grid/
How to edit the main item template of the Events loop?
Edit the page with Elementor:
Or, you can directly edit the Current Events Loop template:
All of the main item's elements are dynamic tags (https://developers.elementor.com/docs/dynamic-tags/), so they pull the individual content of each post/page:
How to edit the Events Loop template's query?
Edit the page with Elementor > Open the Query tab and edit the source, order, etc.
How to edit the Events Loop single post content?
Go to Dashboard > Pages > Click on Еdit:
Edit the "Title", "Excerpt", "Featured image" and the page's Custom Fields (the Date and Location of the event).
Troubleshooting
In you don't see the page's Custom Fields, click on Preferences > Panels > Additional > turn on the "Custom Fields" toggle:
Next, click on the blue button "Edit with Elementor" for editing the single post content (stick with the content available in the Navigator https://elementor.com/help/navigator/ ):
Hint: You can edit the "Title", "Excerpt" and "Featured image" in Elementor > Page settings:
You can repeat the same steps for the Past Events Loop section:
Find here our basic tutorial for the Elementor Builder