We are currently in the throes of transferring all our organisational data from one AGOL portal to a new one. For whatever reason it seems it is impossible to clone view layers (only mildly irritating given how much ESRI promotes their use).
With regard to hosted views, created from join functions, is there an obvious way to reverse engineer these? I've had a look through the JSON, and I cannot see it recorded anywhere the process used to create the join (type of join, fields used etc.).
I suspect I don't want to know the answer here, but is the only solution really to look at the joined data, make that interpretation manually and then recreate each of the (potentially hundreds) of joined layers in the new portal?!
If you go to the item page of the view -> Settings tab -> Update View
can you not see the configuration?