I am starting up a second term of classes with Tinkercad, but having some trouble this time around. I have had my students add the invitation code, but when I go to add them to groups, the screen layout does not give me the checkboxes. Instead, I see up and down arrows beside each user, and no matter how many times I refresh or resign in, the same layout appears. I can't check off students to add them to my groups. Please see the image.
I have 75 new students so organizing them into groups is VERY helpful to keep the users straight.