Hi Andrea!
I dont know the direct absolute answer to your question, but when i want lo load many images at once using the smallest view size (zoom) possible
i move the vertical orange-brown line from the right to the outmost possible left side of the Workspace Window.
Loading images than increases the zoom factor accordingly. But depends also on the image width in height in pixels...
Moving the orange-brown vertical line afterwards back to the right and press "Cascade Window" gets the small zoomed views nicely cascaded
over the Workspace window. Selecting "Cascade Windows/Fit Images" after moving the vertical orange-Brown line to the right also
does a rezoom on all views.
So this already could help you to get many small views at once. Until somebody says - there is a much simpler and more precise solution.
Gerald