This is Rae from Shopify.
Thank you for letting us know that the content box isn't appearing on your end. I'm happy to help investigate this further and track down why this may be happening.
When situations like this occur, they can sometimes be related to local issues that can be fixed with a few different troubleshooting steps. With this in mind, please give these options a try:
Let me know if the content box appears correctly once you've completed the above steps. If not, I can certainly continue lending a hand to make sure we get this resolved.
I wanted to check in with you here and find out if you were able to resolve the troubles you were having with this?
If you're still experiencing issues with the content box not appearing, please let me know. I'm here to help!