Extend the Transparency slider

The transparency - even when on max value (I guess it controls window opacity) - is too transparent.

This makes some color themes hardly readable (eg. MaterialDark) when the underlying window is bright. In comparison, here is a dark bg:

[wtdcode]

@Eugeny So how about another slider for the background opacity?

[Eugeny]

The slider controls the opacity of the window as a whole. If you’re looking to adjust the background transparency alone, it can be done via CSS, e.g.:

body { background: rgba(0, 0, 0, .9) !important; }