The built-in scanning app (Fax and Scan) in Windows has very basic scanning options and it can only scan one page at a time to a file.
The best option is to go to the support page for your scanner on the manufacturers website to see if they provide any scanning software for your scanner.
If not, open the Store app in Windows and search for 'multi-page scan', that search will bring up many free apps that can be used to scan multi-page documents.