Show ActionBar while startup application | Android Studio

I’m trying to make my app look faster when the user opens the app every time, after reading in the android developer site:
https://developer.android.com/topic/performance/vitals/launch-time

I got some information for that. To make the app look fast when running, you need to change a few things in the style.xml file.

I did this for the style.xml file, I changed the color of the window that appears while the application is opening.

Like this:

<item name="android:windowBackground">#162D3A</item> 

Now, how to showing the ActionBar as this app looks like in the picture.
enter image description here

Thanks for any help or information