To hide the VSCode title bar, I used the APC Customize UI extension. This extension allows deep UI tweaks like setting a frameless window ("frame": false) and hiding the title bar. Here's the relevant part from my settings.json:

"apc.electron": {
    "frame": false,
    "titleBarStyle": "hidden",
},
"window.titleBarStyle": "native",
"window.customTitleBarVisibility": "never",

However, note that this extension only works up to VSCode v1.91.1, so I’ve pinned that version and disabled updates:

"update.mode": "none"

Here’s my full settings.json if you want to reference it

For other applications:

• Terminal: I'm using Windows Terminal. You can remove the title bar by going to Settings > Startup > Launch Mode and setting it to Focus. That removes all chrome including the title bar.

• Browser: I use Zen Browser, which doesn’t have a title bar by default, so no extra tweak needed there.