How make transparent and blur main window

I want to make a transparent blurred main window so that the desktop elements are blurred, but I only made transparency
pls hlp…

You can add a material to your CanvasItem. Within the material, use a blur shader. Here I can recommend this website which is providing a lot of ready-to-use shaders.

I probably didn’t explain it well.
I wanted the elements outside the window to be transparent, is there such a possibility?