I confused with the issue

I confused with the issue

This is my code
I’m trying to center my EditText horizontally on the page using biases, but it’s not working as expected. I’ve also tried using guidelines, but they only create space on one side, for instance, placing the guideline on the left with a vertical orientation and a constraint set to 15%. This means the EditText will start 15% from the left edge, but there’s no space on the right. How can I achieve equal spacing on both sides of the EditText?

I have a problem where in the following xml code there are several white areas left because I created a radius of 50 dp. And I want the white area to disappear, how do I do that?