The Preview feature allows you to see your notice or event from the viewers perspective before you publish it live to the app.
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To do this, simply look for the 'Preview Changes' button. It can be found within the Publish Widget of the notice editor.

Once clicked on, a preview will be opened in a new tab.
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​Note: If you have the Web App enabled in your App Settings and have a passcode set, you may be asked for this upon previewing content.