The nantu_mode query variable controls how Nantu operates. It accepts the following values:

1. nantu_mode=qa:
   This enables QA mode, which provides debug messages in the console and displays a QA tab. The QA tab helps you easily identify which test is active and which variation is running. Once QA mode is enabled, it will persist for one hour before automatically reverting to normal mode.
2. nantu_mode=off:
   This disables all active Nantu tests, allowing you to view the site without any tests running. This is particularly useful for determining whether an issue originates from a Nantu test or the site itself.