Hi @sanderlenselink , if you have overlooked something, well that makes two of us unfortunately!
The only way I’ve seen at the moment is to switch back to Classic UI, change it there and then switch to Modern again
Not really a good solution, I know, and worse than that, if you then edit the text in Modern, the formatting disappears.
The one small positive I found though is that emoji entered in the label of a node (using Win “.” keyboard shortcut - or equivalent in non-Windows OS - now appear in colour instead of black and white. So you can make the label stand out a little in other ways, but not like it does with a full colour background.
when importing a workflow from ClassicUI to ModernUI, the comment color prevails;
then when changing the node comment within ModernUI, the color suddenly disappears.
The correct behaviour would be either to remove colors entirely from ModernUI or, alternatively, to have them at least prevail from the ClassicUI, even when the node comments are changed in ModernUI.