are you in the latest version? Update 1.9.1 added the ability to scroll by dragging the slider on the side of the menu!
Actually correction on that, it works for the buildings in the fractured void, it does NOT work for the void hunt upgrade menu atm. (At least on my end.) In fact it seems to be essentially the only screen it isn't working on right now. Even the codex and prestige screens are working right... And unfortunately it looks like the update reset my 'starting' void particle gain to base 10 when I was at 35 (IE 35k null storage) making void hunts far less enticing to do.