What does the Transparency setting in the Paragraph Studio Decorations Section do?

[GarryP]

Windows 10 Home, Publisher 1.7.3.481.

I’ve been playing around with the Transparency setting in the Paragraph Studio Decorations Section and can’t figure out what it does or how to use it.
I set a Decoration to Fill, then gave the decoration a solid fill of colour (looks as I would expect), then tried modifying the Transparency setting but I can’t see much happening except for the Opacity. The same goes when I use a Gradient Fill.
I can change the Opacity of the whole fill – that works okay – but the colour part of the dialog doesn’t seem to affect anything, no matter which colour picker I choose.
The Help doesn’t really tell me much about what it’s supposed to do: “Transparency—click the swatch to display a pop-up panel. See the Gradient editing topic for more information on the settings available.”
Can anyone explain this please? For instance, why would a Transparency setting let me choose a colour, and what should I expect it to do?

Edited February 4, 2020 by GarryP
Added OS and version.

[firstdefence]

It appears to relate to the background fill behind the text, you can add a gradient fill of transparency, if that makes sense.

[DWright]

HI @GarryP,

Thank you for the information this issue is only happening on the Windows version I have logged this with our QA team