Unable to create bespoke thumbnails beyond 4X in Blu-ray Creator Streaming Menu

[C.C. 95]

Now not knowing exactly what you mean as 'the description box', if this refers to the main box which reads in the image example you provide above: "..A mystery drew Hercules and Lolaus.." you can change both the text (and) its size by simply doubling clicking on the text in this box to hi-light the whole text, then click on the T (text box below) and edit as necessary; alter the text to shorten and change to fit what you want to write, resize etc. Mind you, I am using v.13.0.1.6 so perhaps this option is not available in the earlier v.12's.

littlebluealien
O.k. I will try this!
Sometimes I like having the descriptions- but the longer ones ended in the middle of a sentence!

*when I upload my images I have the choice of Thumbnail, Small, Medium, Fullsize, Remove.
do you not get that option?