Fast Bundle can run on your shop through two methods: Using App Embeds within your theme and integrating code directly into theme files. However, only one method should be active at a time. For newer installations, only the "App Embeds" should be on.
1. Activate app embed for Fast Bundle:
Go to the Shopify panel > Online store > Themes > Your live theme> Customize.
Click on "Embed apps".
Toggle on the Fast Bundle and save.
2. Remove the Fast Bundle code from my Theme.liquid file:
When you are done, exit from the "customize" view and return to Shopify admin > Online store > themes > your live theme > Edit code.
Search for the "theme.liquid" file and click on it.
Search for these three lines of code related to Fast Bundle remove it and save. (As a general hint, this three-line code is placed before the </head>)
You are done!
Now Fast Bundle is working only via the "App Embeds" on your theme.