If you would like to not show the Print Friendly & PDF button on certain pages, there's two options. 

Hide Button With CSS

Add the following code to any page to hide the Print Friendly & PDF button.

<style type="text/css" media="all">.printfriendly {display: none!important;}</style>

Show on Posts Only (not pages)

This option shows Print Friendly & PDF on all Post/Article pages. It is removed from all "category pages" and "pages".

1. Go to your WordPress Dashboard
2. Click Settings
3. Click Print Friendly & PDF
4. Select Posts and Save