Kodi on Samsung Dex fails to support full screen mode.
The link below describes how to add support ☺️
http://developer.samsung.com/samsung-dex/modify
Key info pasted below
To implement Multi-Window in Samsung DeX
SDK 24 and higher: Apps targeting SDK 24 and higher automatically support Multi-Window as a native feature by default. However, apps operating in Samsung DeX Desktop Mode must still explicitly enable Multi-Window in the Manifest to be run in a Resizable Window.
To enable Multi-Window for Samsung DeX, paste this code into the Manifest:
<application
android:resizeableActivity=”true”>
</application>
Additional info
Mandatory Requirements (Desktop Mode)
Apps must meet these mandatory requirements to open in Desktop Mode.
1.
Apps must support Android N Multi-Window and explicitly declare android:resizableActivity=”true” in the Manifest.
2.
Apps must support 7 runtime configuration changes and explicitly declare that it meets these conditions in the Manifest with <meta-data android:name=”com.samsung.android.keepalive.density” android:value=”true”/>