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Edit File: main5.php

<?php
/**
 * Seamless Donations by David Gewirtz, adopted from Allen Snook
 *
 * Lab Notes: http://zatzlabs.com/lab-notes/
 * Plugin Page: http://zatzlabs.com/seamless-donations/
 * Contact: http://zatzlabs.com/contact-us/
 *
 * Copyright (c) 2015-2020 by David Gewirtz
 *
 */

//	Exit if .php file accessed directly
if ( !defined( 'ABSPATH' ) ) exit;

//// MAIN - MENU ////
function seamless_donations_admin5_main_menu() {
    $args = array(
        'id'           => 'seamless_donations_tab_main_page',
        'title'        => 'Seamless Donations',
        // page title
        'menu_title'   => 'Seamless Donations',
        // title on left sidebar
        'tab_title'    => 'Seamless Donations',
        // title displayed on the tab
        'object_types' => array('options-page'),
        'option_key'   => 'seamless_donations_tab_main',
        'tab_group'    => 'seamless_donations_tab_set',
        'icon_url'     => 'dashicons-palmtree',
    );
    seamless_donations_cmb2_remove_primary_save_button();

// 'tab_group' property is supported in > 2.4.0.
    if (version_compare(CMB2_VERSION, '2.4.0')) {
        $args['display_cb'] = 'seamless_donations_cmb_options_display_with_tabs';
    }

do_action('seamless_donations_tab_main_before', $args);

// call on button hit for page save
    add_action('admin_post_seamless_donations_tab_main', 'seamless_donations_tab_main_process_buttons');

$args = apply_filters ( 'seamless_donations_tab_main_menu', $args );
    $main_options = new_cmb2_box($args);
    seamless_donations_admin5_main_section_data($main_options);

do_action('seamless_donations_tab_main_after', $main_options);

}

// Remove primary Save button
// derived from https://github.com/CMB2/CMB2-Snippet-Library/blob/master/filters-and-actions/custom-css-for-specific-metabox.php
function seamless_donations_delete_welcome_button($post_id, $cmb) {
    ?>
    <style type="text/css" media="screen">
        input#submit-cmb.button.button-primary {
            display: none;
        }
    </style>
    <?php
}

add_action('cmb2_admin_init', 'seamless_donations_admin5_main_menu');

$object = 'options-page'; // could also be post | term
$cmb_id = 'seamless_donations_tab_main_page';
add_action("cmb2_after_{$object}_form_{$cmb_id}", 'seamless_donations_delete_welcome_button', 10, 2);

//// MAIN - SECTION - DATA ////
function seamless_donations_admin5_main_section_data($section_options) {
    $section_options = apply_filters ( 'seamless_donations_tab_main_section_data', $section_options );

$section_options->add_field(array(
        'name'          => 'Welcome to Seamless Donations',
        'id'            => 'seamless_donations_welcome_area',
        'type'          => 'text',
        'savetxt'       => '',
        'render_row_cb' => 'seamless_donations_render_main_tab_html',
        // this builds static text as provided
    ));
    $section_options = apply_filters('seamless_donations_tab_main_section_data_options', $section_options );
}

function seamless_donations_render_main_tab_html($field_args, $field) {
    $html_folder = dirname(dirname(__FILE__)) . '/html/';
    $html_file   = $html_folder . 'admin-main.html';
    $html_readme = file_get_contents($html_file);

$html_readme = apply_filters('seamless_donations_admin_main_section_data_options', $html_readme);

echo $html_readme;
}

//// ADDONS - PROCESS FORM SUBMISSIONS
function seamless_donations_tab_main_process_buttons() {
    // Process Save changes button

$_POST = apply_filters('validate_page_slug_seamless_donations_tab_main', $_POST);
}