Thank you for your fast reply. I had indeed just discovered in the help text that "the software prevents the screensaver from starting, prevents the computer entering any standby or lower power management mode and using a higher priority." I was just about to add that and request the option to be able to turn the display off, but I understand from your response that it is not possible to have the display turn off.
On this particular laptop I am using for the scans it is unfortunately not possible to turn off the display separately. Another laptop I have does have this option using [Fn + B], but I need to use it on a daily basis and therefore cannot use it for a (long) surface test. My solution for now is to connect an external monitor and switch Windows to that monitor, which I can then switch off using the power button. A little bit of a hassle, but it does the job.
Maybe it is a good idea to add in the help text that because of the necessity to keep the disk spinning and the computer awake the screen also does not turn off. Also, the help text states that the process runs with high priority (as in my quote above). But when I check Task manager I do not see any HDS component running above Standard priority. Has this been changed and/or is this an error in the help text?