"Idris 2 mode" checkbox is missing

[srid]

README says,

Currently the extension will default to v1. If you want it to use Idris 2, change the path in the configuration to your Idris 2 binary, and tick the Idris 2 Mode checkbox.

But I see no such checkbox in VSCode. This is what I see:

Incidentally, the extension throws an error:

with the Idris2 program in question being a simple:

module Main

main : IO ()
main = putStrLn "Hello world!"

[srid]

PEBKAC !

Had the wrong extension installed