Theme, colors, widget size does not work anymore

I did setup a new rpi4B and Node-Red 3.0.2 today.
First everything was OK, but after some time the colours of the dashboard suddenly changed from dark to light. And now I am not able to change the colours and the widget size at all.
Can someone help?

As you can see, the "dark" colours chosen are not set in the ui.
How can this happen?

I think now I know the reason: For any reason dashboard node 'Node-Red Dashboard' was disabled...

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