New user here, been experimenting. Hasura is pretty amazing. Found that, while the error text states the boolean values are case insensitive, they actually only work with lowercase values (at least for the string 'FALSE').

This is the error which shows up in the heroku logs
Fatal Error:- Environment variable HASURA_GRAPHQL_ENABLE_CONSOLE: Not a valid boolean text. True values are ["true","t","yes","y"] and False values are ["false","f","no","n"]. All values are case insensitive

Here is the setting I have