By default, the drawings are created from a model in such a way, that each drawing have just one layout only.
It should be also possible to place the details in multiple layouts of a drawing rather than in multiple files.

This is not an option in the 3D-CAD-World, this is a standard.
For example: I have to place 150 sheet metal details in the drawing, 30 details fit in an A0 drawing. It is desired, the same component designation is always in the title block (e.g. "Sheets"). Why should I generate 5 different drawings = 5 different drawing numbers with the same designation in the title block in order to place these details? It is easier with 5 Laoyuts in one drawing = one drawing number.
This would reduce the number of files (drawings, parts lists, ...), and in total also the file volume.