There’s heaps of different themes (they call them Skins in the wiki), or UIs I guess. I’m currently running Amber with a few tweaks through the setting of the theme itself. The default I think is called Confluence maybe… There’s lots you can try, even ones that make it look like an apple Tv.

This link will run you through how to change the theme…https://kodi.wiki/view/HOW-TO:Change_skins

Edit. Would also recommend looking into real-debrid and running the Seren add-on.