one on ones during campus visit
Whatever the schedule is, it's almost certainly identical for all candidates.  You can't deduce anything about the school's interest from the schedule.

The way my department does tenure-track interviews, the only one-on-one meetings are with the department chair and the dean.  Other than that, there are, as in your description, group interviews with faculty and students, a research talk, a sample class, and meals with a group of faculty.  The schedule doesn't include one-on-one meetings with individual faculty.  And this is the same for all candidates.  

(This is a mathematical sciences department at a medium-sized public university in the US.)