wp_editor customization

What you can do is use the get_current_screen() function to get what screen the current user is on ( in the admin panel ) and only add those global values whenever the user is viewing the post page:

function my_format_TinyMCE( $in ) {
    $screen = get_current_screen();

    if( is_object( $screen ) && 'post' == $screen->post_type ) {
        //styles for the editor to provide better visual representation.
        $in['content_css'] = get_template_directory_uri() . "/build/styles/tiny-mce-editor.css";
        $in['block_formats'] = "Paragraph=p; Heading 1=h1; Heading 2=h2";
        $in['toolbar1'] = 'formatselect,bold,italic,underline,superscript,bullist,numlist,alignleft,aligncenter,alignright,link,unlink,spellchecker';
        $in['toolbar2'] = '';
        $in['toolbar3'] = '';
        $in['toolbar4'] = '';
    }

    return $in;
}
add_filter( 'tiny_mce_before_init', 'my_format_TinyMCE' );

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