Fix overlapping text on your customer login page
This is legacy documentation. It is for themes that predate the
Your Shopify Theme is likely using custom templates for your Customer Account pages, if your Customer Login page looks like this:
To correct the problem:
Scroll down and click on the Additional Layouts tab. From the Customer Area Layout drop-down, choose theme, then click on the Save button below.
With this edit, your Customer Account pages will now be rendered within your Shopify's theme layout. This means that you will see your Shopify Theme header, footer and sidebar on your Customer Account pages. The layout on your Customer Account pages should now look perfectly fine!