I need to set the 'OR' condtion for last where clause but it is setting as AND how can change in magento 2.3

SQL need to change AND condtion to OR in below code

public function getOrders()
    {
        $po_number = "%"."A"."%";
        if (!($customerId = $this->_customerSession->getCustomerId())) {
            return false;
        }
        if (!$this->orders) {
            $this->orders = $this->getOrderCollectionFactory()->create($customerId)->addFieldToSelect(
                '*'
            )->addFieldToFilter(
                'status',
                ['in' => $this->_orderConfig->getVisibleOnFrontStatuses()]
            );
            $this->orders->getSelect()
            ->joinLeft(
                ["sop" => "amt_sales_order_payment"],
                'main_table.entity_id = sop.parent_id',
                ['po_number']
            )
            ->where('sop.po_number LIKE ?',$po_number);
            
            $this->orders->setOrder(
            'ext_order_id',
            'desc'
            );
            echo  $this->orders->getSelect()->__toString();
        }
        return $this->orders;
    }

I the po_number OR condtion need to apply how can i apply this.

Current Query

SELECT `main_table`.*, `sop`.`po_number` FROM `sales_order` AS `main_table` LEFT JOIN `sales_order_payment` AS `sop` ON main_table.entity_id = sop.parent_id WHERE (`main_table`.`customer_id` = '200') AND (`status` IN('canceled', 'closed', 'complete', 'fraud', 'holded', 'partially_shipped', 'payment_review', 'pending', 'processing', 'shipped')) AND (sop.po_number LIKE '%A%')

Expecting Query

SELECT `main_table`.*, `sop`.`po_number` FROM `sales_order` AS `main_table` LEFT JOIN `sales_order_payment` AS `sop` ON main_table.entity_id = sop.parent_id WHERE (`main_table`.`customer_id` = '200') AND (`status` IN('canceled', 'closed', 'complete', 'fraud', 'holded', 'partially_shipped', 'payment_review', 'pending', 'processing', 'shipped')) OR (sop.po_number LIKE '%A%')