I'm Lizzy, one of the Gurus on the support team at Shopify.
I wanted to let you know that I’ve moved your question to a new thread so it can get a bit more visibility and encourage answers from the community!
To answer your question, if you’re referring to this logo that appears at the bottom, that will only be visible if you’re logged into the account. Your customers won’t see this when they visit your site. It is set up so that you have easy access to your admin while previewing the site!
Other than this, how has everything been going with your store so far? Don’t hesitate to let me know if you have any questions about what I’ve said.