If you want to manually remove our app code from the store theme, follow these steps:

1) Visit Store Admin >> Online Store >> Themes >> Actions >> Edit Code

2) Click on the theme.liquid file in the layout section.

3) The theme.liquid file will be opened in the editor.

4) Remove the {% include 'za_product_blocker' %} code that are located below <head> tags in the theme.liquid file

5) Click the Save button to save changes.

6) Now go to the Snippet section and click on the za_product_blocker.liquid file

7)The za_product_blocker.liquid file will be opened in the editor.

8) Click the Delete button to remove the file from the theme.

Now our app code has been removed from your store.