[Nav Segments In Inventory]

I don't know about you, but I have quite a few nav segments. Not only that but loads of other junk in my inventory that I "cannot sell". So, riddle me this, with a full inventory, in which I have only items that cannot leave, how am I to progress with getting infuriated from micromanaging my every inventory slot? Seriously, I looked and couldn't find a solution to this, just more people with the same issue. How is this not all over this forum? Is there an invisible "Delete" button I and most others don't seem to know about? Or has everyone just given in after years of dealing with this terrible inventory system?