You can have a look at Xamarin.Android Layouts , there is a LinearLayout you can have a try . If you set android:orientation="vertical" and drag Button below TextView , then it will show as your wants .

The Xml code will look like follow :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns_android="http://schemas.android.com/apk/res/android"
    xmlns_app="http://schemas.android.com/apk/res-auto"
    xmlns_tools="http://schemas.android.com/tools"
    android_layout_width="match_parent"
    android_layout_height="match_parent"
    android_orientation="vertical">
    <TextView
        android_text="Text"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_textAlignment="center"
        android_fontFamily="monospace"
        android_minWidth="25px"
        android_minHeight="25px"
        android_id="@+id/textView1" />
    <Button
        android_text="Button"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_id="@+id/button1" />

</LinearLayout> 

The effect of user-interface :

Aout using the Xamarin.Android Designer , you can have a look at this doc .

I am trying to make a simple android app by following this tutorial right here: https://youtu.be/5CgQUbnf1Qk

In this video, the guy just seems to drag a button onto his app, and doesnt need to do any realignment for it to be where he wants it to be. He is using VS 2017, and i am using VS 2019, now the problem is when i tried to follow his example, my button goes over the text bar, and i have not found a way to get the button to go under the text bar like in the video. Does anyone know how i can fix this, please? Thanks