modified my configs a bit, not sure if it'll help but EDITOR and VISUAL should be set properly now.

.config/Code/User/settings.json

@@ -22,5 +22,6 @@
             "viewType": "jupyter.notebook.ipynb",
             "filenamePattern": "*.ipynb"
         }
-    ]
+    ],
+    "window.zoomLevel": -1
 }

.config/fish/config.fish

@@ -2,8 +2,8 @@
 # Solomon Laings config.fish
 set fish_greeting
 set TERM "xterm-256color"
-set EDITOR "nano"
-set VISUAL "code"
+set -gx EDITOR (type -p nano)
+set -gx VISUAL (type -p code)
 
 # my bashrc stuff
 alias ..='cd ..'