Dear Grzegorz,
before posting in a forum it's always a good idea to do a search for the topic you are about to post; if you would have done a search for "Epson" and "Overview", you would have found the answer.
Anyway I will answer your question:
The
Epson 4990 is a flatbed scanner; in contrast to the
Epson software SilverFast does only offer an overview dialog for real film scanners.
To scan all images you should set up on frame with all the settings you want to have and copy that frame (by Alt-clicking or holding the Ctrl key while dragging the frame to the new place) to every image in the preview window. After you have done that, you can save this frame layout in the General panel under "Frame Sets" for later use with this film holder.
Best regards
Ralf