I tried to change the theme, but it didn’t work. So, I want help with this issue, I don’t this is a bug of the Xfce Panel itself, maybe it’s related to some system configuration.
P.S.: There is another issue with the panel, but it’s not related to opacity. When I open the panel settings window, it actives a highlight to the selected panel, but it remains even if I close the window:
I also have this occur when I change panel transparency settings, etc. It seems to me that XFCE 4.16 isn’t very polished and does have a lot of bugs to work out.
This not the place here nor the subject of this topic to count the number of XFCE issues or whatever DE, it’s pointless and a waste of time.
There are many DE available if you are not happy with one of them.
i had almost the same problem, with panel not changing to transparent. The transparrent / oppacity control did nothin. Got it to work by changing the panel position.