Default: full-width, hide title

function et_single_settings_meta_box( $post ) {
    $post_id = get_the_ID();

    wp_nonce_field( basename( __FILE__ ), 'et_settings_nonce' );

    $page_layout = get_post_meta( $post_id, '_et_pb_page_layout', true );

    $side_nav = get_post_meta( $post_id, '_et_pb_side_nav', true );

    $project_nav = get_post_meta( $post_id, '_et_pb_project_nav', true );

    $post_hide_nav = get_post_meta( $post_id, '_et_pb_post_hide_nav', true );
    $post_hide_nav = $post_hide_nav && 'off' === $post_hide_nav ? 'default' : $post_hide_nav;

    $show_title = get_post_meta( $post_id, '_et_pb_show_title', true );

    if ( is_rtl() ) {
        $page_layouts = array(
            'et_left_sidebar'    => esc_html__( 'Left Sidebar', 'Divi' ),
            'et_right_sidebar'   => esc_html__( 'Right Sidebar', 'Divi' ),
            'et_full_width_page' => esc_html__( 'Fullwidth', 'Divi' ),
        );
    } else {
        $page_layouts = array(
            'et_full_width_page' => esc_html__( 'Fullwidth', 'Divi' ),
            'et_right_sidebar'   => esc_html__( 'Right Sidebar', 'Divi' ),
            'et_left_sidebar'    => esc_html__( 'Left Sidebar', 'Divi' ),

        );
    }

    $layouts = array(
        'light' => esc_html__( 'Light', 'Divi' ),
        'dark'  => esc_html__( 'Dark', 'Divi' ),
    );
    $post_bg_color  = ( $bg_color = get_post_meta( $post_id, '_et_post_bg_color', true ) ) && '' !== $bg_color
        ? $bg_color
        : '#ffffff';
    $post_use_bg_color = get_post_meta( $post_id, '_et_post_use_bg_color', true )
        ? true
        : false;
    $post_bg_layout = ( $layout = get_post_meta( $post_id, '_et_post_bg_layout', true ) ) && '' !== $layout
        ? $layout
        : 'light'; ?>

    <p class="et_pb_page_settings et_pb_page_layout_settings">
        <label for="et_pb_page_layout" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Page Layout', 'Divi' ); ?>: </label>

        <select id="et_pb_page_layout" class="wpc" name="et_pb_page_layout">
        <?php
        foreach ( $page_layouts as $layout_value => $layout_name ) {
            printf( '<option value="%2$s"%3$s>%1$s</option>',
                esc_html( $layout_name ),
                esc_attr( $layout_value ),
                selected( $layout_value, $page_layout, false )
            );
        } ?>
        </select>
    </p>
    <p class="et_pb_page_settings et_pb_side_nav_settings" style="display: none;">
        <label for="et_pb_side_nav" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Dot Navigation', 'Divi' ); ?>: </label>

        <select id="et_pb_side_nav" name="et_pb_side_nav">
            <option value="off" <?php selected( 'off', $side_nav ); ?>><?php esc_html_e( 'Off', 'Divi' ); ?></option>
            <option value="on" <?php selected( 'on', $side_nav ); ?>><?php esc_html_e( 'On', 'Divi' ); ?></option>
        </select>
    </p>
    <p class="et_pb_page_settings">
        <label for="et_pb_post_hide_nav" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Hide Nav Before Scroll', 'Divi' ); ?>: </label>

        <select id="et_pb_post_hide_nav" name="et_pb_post_hide_nav">
            <option value="default" <?php selected( 'default', $post_hide_nav ); ?>><?php esc_html_e( 'Default', 'Divi' ); ?></option>
            <option value="no" <?php selected( 'no', $post_hide_nav ); ?>><?php esc_html_e( 'Off', 'Divi' ); ?></option>
            <option value="on" <?php selected( 'on', $post_hide_nav ); ?>><?php esc_html_e( 'On', 'Divi' ); ?></option>
        </select>
    </p>

<?php if ( 'post' === $post->post_type ) : ?>
    <p class="et_pb_page_settings et_pb_single_title" style="display: none;">
        <label for="et_single_title" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Post Title', 'Divi' ); ?>: </label>

        <select id="et_single_title" name="et_single_title">
            <option value="off" <?php selected( 'off', $show_title ); ?>><?php esc_html_e( 'Hide', 'Divi' ); ?></option>
            <option value="on" <?php selected( 'on', $show_title ); ?>><?php esc_html_e( 'Show', 'Divi' ); ?></option>
        </select>
    </p>

    <p class="et_divi_quote_settings et_divi_audio_settings et_divi_link_settings et_divi_format_setting et_pb_page_settings">
        <label for="et_post_use_bg_color" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Use Background Color', 'Divi' ); ?></label>
        <input name="et_post_use_bg_color" type="checkbox" id="et_post_use_bg_color" <?php checked( $post_use_bg_color ); ?> />
    </p>

    <p class="et_post_bg_color_setting et_divi_format_setting et_pb_page_settings">
        <input id="et_post_bg_color" name="et_post_bg_color" class="color-picker-hex" type="text" maxlength="7" placeholder="<?php esc_attr_e( 'Hex Value', 'Divi' ); ?>" value="<?php echo esc_attr( $post_bg_color ); ?>" data-default-color="#ffffff" />
    </p>

    <p class="et_divi_quote_settings et_divi_audio_settings et_divi_link_settings et_divi_format_setting">
        <label for="et_post_bg_layout" style="font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Text Color', 'Divi' ); ?>: </label>
        <select id="et_post_bg_layout" name="et_post_bg_layout">
    <?php
        foreach ( $layouts as $layout_name => $layout_title )
            printf( '<option value="%s"%s>%s</option>',
                esc_attr( $layout_name ),
                selected( $layout_name, $post_bg_layout, false ),
                esc_html( $layout_title )
            );
    ?>
        </select>
    </p>
<?php endif;

if ( 'project' === $post->post_type ) : ?>
    <p class="et_pb_page_settings et_pb_project_nav" style="display: none;">
        <label for="et_project_nav" style="display: block; font-weight: bold; margin-bottom: 5px;"><?php esc_html_e( 'Project Navigation', 'Divi' ); ?>: </label>

        <select id="et_project_nav" name="et_project_nav">
            <option value="off" <?php selected( 'off', $project_nav ); ?>><?php esc_html_e( 'Hide', 'Divi' ); ?></option>
            <option value="on" <?php selected( 'on', $project_nav ); ?>><?php esc_html_e( 'Show', 'Divi' ); ?></option>
        </select>
    </p>
<?php endif;
}