The trail has not limitations.
You seem to have imported a jpg, which returns only the 3 WB options.
You need to work with RAW files to have the full set.
Oh, thank you very much F. McLion. I did not know that. I will import a RAW file to play.
To see what LR can do and 'play'/discover its performance, I strongly suggest to work with RAW files - that's what it is made for.