Hello @Fausto and welcome to the forums!
Good question. The Events Calendar does indeed use rich snippets for events in the markup which allow the events to display in a search engine results entry like that.
All events contain them, so that makes me wonder if Google is being selective in which ones are displayed. It looks like the results in the middle of the screenshot you shared show all upcoming events in the order in which they occur. However, the events in the top of the screenshot seem to show one event per day rather than all events if more than one exist on a particular day.
Because of this, I think this is more a case of Google being selective in what is being displayed up top. There is no setting in the plugin itself to super-charge an event for search results like this, but you can rest assured that the plugin is doing the very best it can to inform Google that the post exists, that it is recognized as an event and that it can and should be displayed as an event in search results.
Sorry I don’t have more of a concrete solution for you here, but does this at least help answer your question? Please let me know!
Geoff