Using Theme.AppCompat.NoActionBar

Question

Defined the Theme to use Theme.AppCompat.NoActionBar in styles.xml. The background color, is displayed with opaque. This happens only first time. If swipe killed the application opaque is not observed.

    <style name="Theme.AppCompat.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item></style>

Working, after swipe kill. could observe there is no opacity opaque.

Working: Tried with theme, Theme.AppCompat.DayNight.NoActionBar. With this theme cannot see the opaque. Suggest with Theme.AppCompat.NoActionBar how to get rid of opaque.