I'm seeing --PREVIEW-- in my Dialogue

Iris uses a Test Indicator to show you when a Dialogue is in Test.
Pattr uses some specific text when running a Dialogue in the Test phase of the Launch Pad to allow you to differentiate between Test and Live.
You may see the text "-- PREVIEW --" if you're testing your Dialogue. To remove this, simply Promote the Dialogue from Test to Live as seen below.
In the Actions dropdown of the Test phase, click Promote to move this version of the Dialogue to the Live phase.