Hello,
this is controlled by the option Collect files in the window "Select source", which appears before scanning and where you click on your scanner:
- Collect files checked: PDF24 collects all scanned pages and passes them to the PDF24 Creator together as one file when scanning is finished. The Creator then only comes up once at the end.
- Collect files not checked: each page is passed to the Creator as a separate file as soon as it has been scanned, so the Creator comes up after every page.
Please check Collect files and then click on your scanner. PDF24 remembers this option, so you only need to set it once.
Choosing a scanner in advance, so that the window "Select source" is skipped, is not possible yet. It is on our to-do list.