Practice
How to use and practise it
Play it over a dominant 7th chord on the root, or a vamp between the root chord and the major chord a whole step below. Aim for the major 3rd and the minor 7th.
Same notes, another root: C major. The shapes on the neck are the same; only the note you start and end on changes.
The major scale has a major 7th; Mixolydian lowers it to a minor 7th. Compare the two: G major.
Set the tempo low, play each position up and down with the button above, then try it yourself at the same speed. Raise the tempo by 4 BPM only when it is clean.