Allowing editor transparency to be set

[eunos-1128]

Is your feature request related to a problem? Please describe.
I would like to be able to make the editor transparent because when I set a background image, I want to show the image but much of it is hidden in the editor area.

Describe the solution you'd like
I am thinking that it would be better to be able to make the background transparent by selecting the transparency of the editor panel from the editor item in the settings.

Describe alternatives you've considered
Another idea would be to implement acrylic opacity like the Windows Terminal below