eBay are rolling out changes to how your Storefront will operate and look from May 2018. If you currently have a custom page then these changes will not affect you at the moment.
If you need to check if you have a custom page you can follow the instructions on this page.
There's another way you can check to see if you have a custom Storefront, or an eBay designated Storefront. If your URL contains /str/ then you are on the new eBay Storefront, if your URL contains store.ebay then you are on a custom page. If you have any further questions please contact Frooition support through your Freedom account, or have a look at this article.