shopify by default adds an added app block to all pages where template is default

Shopify Discussion
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2 problems:

  1. I created an app block and when i added that app block which basically adds a new section having some designs , ui in it. to a page ex: “test page” . shopify adds that app block to all other pages where template is default template. like if i have a page called test 2 then it also adds that app block to page 2 too. I have tested other apps app block. it does the same . how can i fix that? . i want it to show up on a page where i added it !
  2. Beside , It take a default width which breaks my design of that app block . how to fix that?