My farmer won't stop foraging? I want him to research! What should I do?

go to details and check research

they are just stubborn let him forage

Go onto details. There is a list with all the talents. On the right side of each talent is a box. Click the box next to the research talent and that becomes what he is most interested in. Use this for your other villagers as well to get them all to have particular jobs that they actually WANT to do.