How I can hide or delete unused intputs from UI?
Are these the UI options for some Item that you are showing us? Edit the Item metadata to remove options you don’t want.
Yes, it is Item Input Source from Denon/Marantz binding.
What should I edit in metadata?
Not sure why or if it’s necessary (can’t remember), but I added values in both State Description and Command Options. Mine looks like this for both State and Command:
I added it only in State Description and it’s working for me.