Currently the process of assigning parameters to knobs/switches etc. is done per parameter. While I’m not suggesting to remove that, when it’s the only way to assign parameters to controllers, it causes some notable UX issues because there’s no way to view all your assignments from a single page. This makes it much harder to
a) design a good strategy for your assignments
b) memorise or refresh your memory on what you’ve already set up
c) reorganise the assignments
So I think there should be a single page which shows all assignments, and allows remapping them from there. Ideally it would show not just the Device matrix, but also MIDI / control chain / CV assignments too, although if that was too much to fit on one web page, it could be broken into tabs much like the individual parameter assignment already works. This page would present a list of all the parameters available for assignment, and make it easy to find the one you want to assign quickly (e.g. filtering by plugin, doing a text search for the plugin / parameter name).
This feature request probably applies equally to the Duo and Duo X