My Android Studio keeps ignoring Large Layout and picks Normal for ALL screens

Question

I'm using the Layout Variants tool to create differents sizes for my layout.

the problem is that when i pick any large Device to preview my layout..

it keeps using the normal size

how can i force it to pick the right layout for the screen ?

by the way i already did the AndroidManifest support screens

    <supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:xlargeScreens="true" />

but still having problems!

also my app icon looks so small too in my phone!

any idea?