Mode
F Lydian
The F Lydian mode — F G A B C D E — shown across the guitar neck.
Swipe the neck sideways to see the higher frets.
F Lydian is the major scale with one note changed — the #4, B. That single note is what the mode sounds like; lean on it and the colour is obvious, avoid it and you are just playing major.
Notes
F G A B C D E
Intervals
1 2 3 #4 5 6 7
Parent scale
C Major
Degree of parent
4
The tool shows this from its parent key, C major, with F marked as where Lydian begins, the same seven notes centered on C.