An F or a B chord aren't made as 'open' chords but can be adapted from others by moving other them up the neck.
Try creating a B from an A, by clicking the transpose arrow so it moves up two frets. Each transposer click moves you one SEMITONE (half a tone) higher in pitch. So, between A and B is one whole TONE.
You change an E major to F major with only one position change, because E to F and B to C are only a SEMITONE apart. All the rest are a TONE apart, having one intermediary note or chord called a flat (b) or sometimes a sharp (#). Therefore a Bb is actually the same as an A#.