How do I remove VS Code & settings from Ubuntu?

Try renaming ~/.config/Code/User/settings.json.

Or just move/delete the folders ~/.config/Code and ~/.vscode.

You may want to backup any code snippets in ~/.config/Code/User/snippets/

See also: Visual Studio Code User and Workspace Settings

Remove software

If you installed via Snap:

$sudo snap remove vscode
If you installed via apt:

$sudo apt-get purge code
If you installed via Ubuntu Software, open Ubuntu Software, look for the app in the installed category, and click on remove.

Remove settings

$cd ~ && rm -rf .vscode && rm -rf .config/Code

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