Android Studio Isn`t Showing Layout Properly

I started learning java and then thought about working with Android Studio. I installed Android Studio in Ubuntu and this is what it shows me. Can someone help me with this?

Solution 1:

I have this problem whenever I create a new project in Android Studio, what you have to do is go to the styles.xml file and change the following line:

<style name = "AppTheme" parent = "Theme.AppCompat.Light.DarkActionBar">

And replace it with:

<style name = "AppTheme" parent = "Base.Theme.AppCompat.Light.DarkActionBar">

Split screen