Hi there,
Hmm, I think we will need a little more information before we can start to pinpoint the issue.
Here are some suggestions:
1. Are you talking about the settings in your wp-admin dashboard, or something else? Do you have a link to the website you’re working on?
2. Before you restarted your store, did you make a backup? More information on backups here:
WordPress Backups
3. Can you walk us through the steps you took to restart your store up until the panel disappeared?
This might be a WordPress issue, or it might be caused by whatever plugin you used to build your store. With a little more information, let’s see if we can help you here or if there is another forum where more plugin-specific experts can assist you. ??