Need help with the mobile app- I'm a 14yr old coder

Hi! I’m young programmer of 14 yrs, who just started coding. In my mobile app, that doesn’t show "the notification widget and some other sections.

this img was from a youtube video which I was following.
I’ve downloaded it from the offical link that was on Google play store and my phone is a Galaxy with Android OS. I’m making a gas sensor circuit for a competition (and I have 2 more days left) and I’m really troubled now due this issue. If there’s anyone who can help me or tell me what’s going on I’d be really glad.
Thank you

This is a screenshot for a Blynk Legacy project.
Blynk Legacy is now discontinued and has been replaced with Blynk IoT.

You should read this for more info…