Android Studio在版本3.3中的布局编辑器中禁用了textview周围的阴影

TextView的左侧和右侧在Android Studio 3.3中的LinearLayout中包裹着一个奇怪的阴影.安装后，该阴影不会出现在设备中，而只会出现在编辑器中.这是Android Studio中某些指示的错误还是新功能?如果这是一项功能，是否有办法将其禁用?

There is a weird shadow at the left and right of TextView when it is wrapped with in LinearLayout in android studio 3.3 . This shadow does not appear in device after installation , it only appears in editor . Is this a bug or new feature for some indication in android studio ? If this is a feature , Is there a way to disable it ?

test.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

<LinearLayout android:layout_width="wrap_content"
              android:layout_height="wrap_content">

    <TextView android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="Shadow Appear"/>
</LinearLayout>
</RelativeLayout>