The Push Notification preview is visible on:
Step 2. Content - in this step, the preview adapts to the changes that are being made. To see how a specific contact will see the message (with personalized details), choose the contact from the Preview Contact selection bar above the Push preview
Step 4. Summary - on the summary step, a Push preview will be shown on the left-hand side of the screen. To change content, go back to step 2.
Purpose
The preview offers you a visual representation of your push notification, that (in step 2) constantly adapts to the content changes that are being made.
The Summary step, however, offers a preview of the final version of a push notification. This way, you can review the content together with all other sendout parameters and potentially return to some specific step to make changes. If what is represented in the Summary is reflecting your goals in terms of content and sendout, you can save the message and it will be ready for sendout according to your setup.
Attributes
Personalized content creates individual push notifications that change according to the values stored in the profile attributes of your contacts. Personalizations affect the size, display, and content of each push notification. In the Personalization area of the window, you can select a specific contact, to see how your personalized push notification changes.