On all post types details page, a print button will appear on top:





This element can be hidden by simply adding this CSS code to your websites Custom CSS/HEAD section:


a.btn.btn-default.btn-sm.pull-right.print-btn.hidden-xs {
    display: none;
}


This section can be found under Settings --> Design Settings --> Custom CSS/HEAD section:





This is how the post details page looks after the code has been added: