AdMob Free: Banner Size Problem

Hey There, I’ used AdMob Free Plugin, My AdMob works perfectly actually. But I’ve a problem with banner size.
I tried to show it Large banner, but phone is still showing the small banner.
Here’s my Function;

public funcBottomBanner(){

        const bottomBannerConfig: AdMobFreeBannerConfig = {
            id: 'ca-app-pub-3940256099942544/6300978111',
            isTesting: true,
            autoShow: true,
            size: 'LARGE_BANNER',
            bannerAtTop: false

        this.admobFree.banner.prepare().then(() => {
        .catch(e => console.log(e)); 

help pls

How do you have your ad id set up?

it’s a test Id which given by google here;

Did anyone found the solution? I’m facing the same issue.