Accidently Enabled REST Calls Only - JIRA Web UI is Not Responding

Hi There;

I recently installed the API Tokens for JIRA application onto our JIRA Server instance, but accidentally enabled REST Calls Only (which, has taken down the UI web aspect of our JIRA instance). How would I be able to undo this change (or update this configuration value and restart our JIRA instance), so the web logins are re-enabled once more? Thank you!