I have added some filter in Sales -> Order and for that add a di.xml file.
di.xml file
<?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\Sales\Block\Adminhtml\Order\View\Info">
<plugin name="Custom_checkout_custom_fields_show_fields" type="Custom\CheckoutForm\Plugin\Block\Adminhtml\CustomFields" sortOrder="99999" />
</type>
<type name="Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory">
<arguments>
<argument name="collections" xsi:type="array">
<item name="sales_order_grid_data_source" xsi:type="string">Custom\CheckoutForm\Model\ResourceModel\Order\Grid\Collection</item>
</argument>
</arguments>
</type>
<type name="Custom\CheckoutForm\Model\ResourceModel\Order\Grid\Collection">
<arguments>
<argument name="mainTable" xsi:type="string">sales_order_grid</argument>
<argument name="resourceModel" xsi:type="string">Magento\Sales\Model\ResourceModel\Order</argument>
</arguments>
</type>
On adding this file don't know what's the issue but my content -> pages and content -> blocks are not shown it shows an error Not registered handle cms_page_listing_data_source.
Any help is appreciated.