Just curious, why did you reduce the Sentinel-2 stack to the visual bands? You could get way better results with the full multi-specral information.
I am still wondering where the screenshot image is from: You cannot display an RGB image of the original bands after the classification (because only class number and confidence are left).
Sorry for the late answer. I am very new to SNAP and trying to figure out what fits the best for my research. I am doing a classification of a coastline (Lithology, Sand, Rock, Dunes, Vegetation etc.). Its quite hard due to vegetation cover and buildings, but we’ll see.
I started over again and for some reason everything worked without any problems. Probably just some saving/location error.
thank you for reporting - happy to hear that you solved your problem! Good luck with the classification - let us know if you encounter any other problems.