Hi @jfen22,
A warm welcome to the Bunnings Workshop community. It is fantastic to have you with us.
To start with, please remember that there are always risks when you are working around glass, especially semi-frameless glass where the corners are exposed. Please remember to wear personal protective equipment, including gloves, long protective clothing, enclosed shoes and eye protection, as there are risks of laceration if the glass were to shatter.
With this being said, it looks like the frame around your door panel has shifted, meaning the panel has dropped out of the channel at the top.
Is it possible to get some additional photos? Specifically, the bottom of the glass panel and the gap to the ground, a photo showing the gap on the side of the panel opposite the pivot hinge and a photo of the corner where the vertical frame hits the horizontal frame at the bottom of the panel.
The aluminium frame has likely shifted at the bottom corner, or the pivot hinge at the bottom has allowed the frame to drop.
It may be possible to fix it yourself, but I would have to see those additional photos to advise you exactly how to go about it.
As I have mentioned, there are always risks when you are working around glass, so if you aren't confident, it is likely worth contacting a glazier for their assistance.
Let me know how you get on.
Jacob
