Workspace Switcher - how to change colours so 'in use' workspace shows up better

[Chris Green]

I am running xfce4 on two Debian 12 systems, it all works very well in
general, thank you XFCE developers.

I would like to be able to change the way the 'in use' workspace is
highlighted in the workspace switcher, as it is it's quite difficult to
tell which is the 'in use' one because it's just a little bit darker
than the other workspaces and that doesn't show up well.

Changing the style setting in Appearance doesn't seem to affect the
workspaces much.  Are there some specific settings for workspace
colours anywhere?

-- 
Chris Green