Hey!
I tried this out too but still don’t see a difference 
Topic summary
Goal: Hide the login link on the checkout page only, while keeping the login in the site header unchanged.
Key info and attempts:
- Store URL provided: truenorthshop.com. Multiple helpers asked for URL/password to inspect.
- Suggested setting: Settings > Customer Accounts > Show login links. This is global and not checkout-specific, so it risks removing header login too.
- Platform limits highlighted: Checkout customization is restricted; only Shopify Plus allows edits to checkout. A Shopify rep noted you cannot remove the login section on checkout, only adjust styling (e.g., colors).
- CSS workarounds proposed: A selector added to base.css to hide the button; the OP’s theme lacks base.css. They tried adding CSS in snippets/custom-styles.liquid, theme custom CSS, and theme.liquid—no effect. One reply’s code block appeared empty.
Current status:
- No working solution achieved. All CSS attempts failed, likely due to checkout restrictions and scope.
- Open question: Is the store on Shopify Plus? Without Plus, removing/hiding the checkout login while keeping the header login appears unsupported.
Notes: Screenshots showed the target login button and checkout appearance settings; they are illustrative but not essential to the outcome.