sneak button not opening gui

i fiqured it out its Lshift+Lctrl+rightclick 👍

You need to hold SHIFT+CTRL and right click to open the wand gui.
There is also a shortcut for changing wand modes: hold down SHIFT and left-click with the wand.

thanks for helping i saw ur instructions i got the case of the dumbs :)

I had the issue that opening a GUI while sneaking at an edge causes you to fall after you close the UI.

That's why I had to change the key combination, because I kept dying in Skyblock. You can change it in the client config file if you want though.