Plasma Panel transparance is bugged, stays transparent

[cscs]

@Lamdarer

Notice that the setting hasn’t changed

This tells me your theme is not compatible with plasma 6 or is otherwise incomplete.

@Lamdarer

I am using the Breath Panel, however creating a default panel to test if the setting works with that shows that it doesn’t.

Please switch your desktop theme.
Breeze as the control.

Extra explanation:
Those settings correspond to “Opaque”, “Solid” and “Translucent” folders in the plasma desktop theme directory. I just checked and Breath does not have these directories. So it will not function correctly with those plasma panel settings.

For some further styles besides the default that I know works with plasma 6 see all the Mace things:

MACE · GitLab