Canvas app screen height not responsive

[Syndicate_Admin]

Please help! I created a shopping cart app using powerapps. It works, I love it!

I then created a QR code for my app, again that works. My only disappointment is where the height is not occupying the entire mobile screen, it just stays in the middle. The width fits like a glove.

What do I need to do to correct the height. I need your assistance please. Thank you

[Syndicate_Admin]

How can I extend the length to fit the mobile screen?