I’m new to Nextcoud, and to contributing here as well, so let me know if this is in the wrong place or way to report this 
I got stuck for a while wanting to create a new list, because of this interface element:
This hover appears on the arrow-right icon, that probably should just read “Save list” or something. Maybe it’s called "Add new list’ because the first time you add a list, the same UI element is used?