I am currently working on the following tutorial. After being rejected twice now on Shopify and finding the second rejection strange, like no text on images, no keywords that are general because an app developer used it as a name, etc....
I want to provide my app outside Shopify for Shopify users. Then I could use the name I like and the search terms.
Which part of the code I need to change that my app is not embedded?
You could do a private app, that should not be reviewed by Shopify.
But you won't be able to add it to the app store...
My advice is to read carefully the app submission guidelines: https://shopify.dev/concepts/app-store/getting-your-app-approved/app-requirements
I also got sent back for "no text on key benefits images", fix what the review team asks for, comply and you will be approved.