Android Question Second Program GUI Size Problem

I read through and followed the coding for the Second Program. However, when I run it on my Samsung Flip 4 phone, all the components on the screen are very small. I created a variant to match my phone and used that. In the designer, the dark gray section does not match my phone's variant so perhaps that is the issue.

Zip file attached and a screen shot of my designer.

Thank you for any help in understanding what I am doing wrong.