I have no idea

lua/config/plugins/tree.lua

@@ -10,13 +10,18 @@ return function(use)
         config = function()
             vim.cmd [[ let g:neo_tree_remove_legacy_commands = 1 ]]
             require 'neo-tree'.setup {
+                close_if_last_window = true,
                 filesystem = {
                     filtered_items = {
                         visible = true,
-                    }
+                    },
                 },
                 window = {
-                    width = 30,
+                    width = 25,
+                    mappings = {
+                        ["e"] = "none",
+                        ["j"] = "toggle_auto_expand_width",
+                    }
                 },
             }