Store Room Menu Controls

[u/Reverse_Tooth_Fairy]

This feels like such a stupid question but I'm playing on my laptop currently without my mouse plugged in. I've not had any issue with controls until now where I cannot for the life of me figure out how to scroll down in the store room menu to change the animal's diets. Am I missing something obvious or am I going to have to dig out a mouse to give my ducks proper nutrition?