Wow, thanks so much! I tried your first suggestion with replacing "supertext.Text" with "supertext._text" and it seems to have done the trick!
Legend! Thank you kindly 🙏🙏❤️
Incidentally, yes, my SubtitlesUI does have quite a few components, the Panel AND the TextBoxContainer have a vertical layout group and a content size fitter, I fiddled until I could get the coloured backing background to fit whatever text was being displayed and this seemed to work.
