If you want to add a new button on the sales order view page in the admin side then you have to do that by the plugin.

Please follow the below steps.

Step 1: Create a di.xml file on the below path and paste the below code in it.
Path: app/code/Magemonkeys/CustomOrderButton/etc/adminhtml/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Backend\Block\Widget\Button\Toolbar">
        <plugin name="add_custom_button_toolbar" type="Magemonkeys\CustomOrderButton\Plugin\CustomButtonPlugin" />
    </type>
</config>

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

</type>

</config>

Step 2: Create the plugin file on the below path and paste the below code in it.
Path: app/code/Magemonkeys/CustomOrderButton/Plugin/CustomButtonPlugin.php

<?php declare(strict_types=1);

namespace Magemonkeys\CustomOrderButton\Plugin;

use Magento\Sales\Block\Adminhtml\Order\Create;
use Magento\Framework\View\Element\AbstractBlock;
use Magento\Backend\Block\Widget\Button\ButtonList;
use Magento\Backend\Block\Widget\Button\Toolbar as ToolbarContext;

class CustomButtonPlugin
{
    public function beforePushButtons(ToolbarContext $toolbar,AbstractBlock $context,ButtonList $buttonList): array {
        $orderObject = false;
        $layoutName = $context->getNameInLayout();
        if ('sales_order_edit' == $layoutName) {
            $orderObject = $context->getOrder();
        }

        if ($orderObject) {
        	$url = 'My Custom URL'
	        $buttonList->add('custom_btn',['label' => __('Custom Button'),'on_click' => sprintf("location.href = '%s';", $url),'class' => 'primary custom_button','id' => 'custom_btn']);
        }

        return [$context, $buttonList];        
    }
}
?>

<?php declare(strict_types=1);

namespace Magemonkeys\CustomOrderButton\Plugin;

use Magento\Sales\Block\Adminhtml\Order\Create;

use Magento\Framework\View\Element\AbstractBlock;

use Magento\Backend\Block\Widget\Button\ButtonList;

use Magento\Backend\Block\Widget\Button\Toolbar as ToolbarContext;

class CustomButtonPlugin

{

public function beforePushButtons(ToolbarContext $toolbar,AbstractBlock $context,ButtonList $buttonList): array {

$orderObject = false;

$layoutName = $context->getNameInLayout();

if ('sales_order_edit' == $layoutName) {

$orderObject = $context->getOrder();

}

if ($orderObject) {

$url = 'My Custom URL'

$buttonList->add('custom_btn',['label' => __('Custom Button'),'on_click' => sprintf("location.href = '%s';", $url),'class' => 'primary custom_button','id' => 'custom_btn']);

}

return [$context, $buttonList];

}

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