Smart banners are enabled by default in Appodeal SDK.

Smart banners can render screen-width banner ads adapting to different screens.

The sizes for Smart banners vary depending on device resolution:

Ad Height: 32 dp  
Device screen height: ≤ 400 dp

Ad Height: 50 dp
Device screen height: 400 dp and ≤ 720 dp

Ad Height: 90 dp
Device screen height:  > 720 dp

To disable Smart Banners you can invoke this method (Native Android example):

Appodeal.setSmartBanners(false);

In this case, banner size for both phones and tablets is 320x50. To enable 728x90 banners for tablets you can invoke this method (Native Android example): 

Appodeal.set728x90Banners(true);

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