Is there a way to reset all Calva vscode settings to their "factory defaults"?
I think you can find them all by locating all the VS Code settings files that might apply...
find ~ -name settings.json
And then decide whether to scrutinize the files one by one or just delete them
(Edit: I have not tried this)
Just to add - I think VSCode has per-project settings too? So you might try looking in your project directory as well. When testing extensions, I've used VSCode's Profiles:New Profile... but that's not perfect either.