I did read several docu pages and also some discussions here in the online community. Still this topic confueses me. I don´t really get the difference / different use cases between "field configuration" and/or "screen".
One thing that even confuses me more (as often said these things do more or less the same) I cannot really "reduce"/make my screen/issue lightweight with the "screen" but only with the field configuration (eg. I don´t want to see "fix version" etc. in issues)
I exclueded all those fields from my screen but still see them in the view mode (see screenshots):


Could somebody please bring some light into the dark in my brain? 😂🙈
Best
Stefan