G Major Barre Chord
This alternative G Major Barre is the ‘B’ Shape played on the 10th fret.
This means that your 1st finger should be flat across all the strings at the 10th fret whilst your thumb should be around halfway down the back of the neck of the guitar.
This will allow you to fret the 2nd, 3rd and 4th fingers and increase your ability to bridge the strings.
Alternatively you could bridge your 3rd finger across the D, G and B strings rather that fret them with your 2nd, 3rd and 4th fingers.