Every fingering that fits a hand
1033
open · no 5
103x
open · no 5
1333
moderate
x88a
moderate · barre · no 5
What is true of it
G♯maj7 is G♯, B♯, D♯ and F𝄪 — 1, 3, 5 and 7 counted from G♯.
F𝄪 is a double sharp, and it has to be: every letter from G♯ upwards is used once, so the 7 cannot be written any other way.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 4 fingerings below is 1033: 3 fingers, held at the 1st fret.
2 of them use open strings, which is what makes a shape quiet to change to.
1 of the 4 need a barre.
It leaves out the 5. 4 strings cannot carry 4 notes, and the 5 is the one this chord can lose without changing what it is.
Where its notes are on the neck
The brass dots are G♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
G♯maj7/B♯
5746
G♯maj7/D♯
888a
G♯maj7/F𝄪
004x
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.