In SAP Fiori elements, the flexible column layout allows you to view both the list report and the object page in the same screen, without navigating back and forth between them.
You can also display two object pages next to a list report. Each page is displayed in its own column, and you can adjust the column width if necessary.
The flexible column layout can be configured manually in the
manifest.json file. You can also configure the layout using the Page Map.