How can I make SQS send message as a batch instead of seprately

I have a lambda function called service A in 5 different region, and when they are sending a message at the same time together, my lambda function called service B cannot receieve the message as a batch, but it received the message in seprate call , How can I achieve if service B can surely get the 5 message from lambda service A at one time instead of seprately getting them

Below is my code of SQS and lambda code set up

   const queue = new Queue(this, 'SqsQueue', {

            receiveMessageWaitTime: Duration.seconds(20),
            visibilityTimeout: Duration.seconds(300)

        })


        queue.grantSendMessages(role)


        const readSqsFn = new NodejsFunction(this, 'send', {
            timeout: Duration.seconds(30),
            reservedConcurrentExecutions: 1
        })



        const sesPolicy = new aws_iam.PolicyStatement({
            actions: ["ses:SendEmail",
                "ses:SendRawEmail"],
            effect: aws_iam.Effect.ALLOW,
            resources: ['*']

        })

        readSqsFn.addToRolePolicy(sesPolicy)


        queue.grantConsumeMessages(readSqsFn)

        readSqsFn.addEventSource(new SqsEventSource(queue, {
            batchSize: 10
        }))

export const handler = async (
    event: SQSEvent,
    context: any = {}
): Promise<any> => {


 

    console.log(event.Records)
    for (const record of event.Records) {

        console.log('sqs record:', record?.body);




    }




};