Magisk/app/src/full/res/layout/custom_channel_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="15dp"
    android:paddingTop="5dp"
    android:paddingRight="15dp"
    android:paddingBottom="5dp">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:labelFor="@id/custom_url"
        android:text="@string/settings_update_custom_msg"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="?android:textColorPrimary" />

    <EditText
        android:id="@+id/custom_url"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textUri" />
</LinearLayout>