If you’re looking in the Apps section along the top (right next to Settings), then that will only show you apps that you can download.

If you’re looking in your “Your Apps and Channels” bar under the “Home” section, it won’t show up there until you open it for the first time.

To open it for the first time, go to the “Home” section, scroll down to the “Your Apps and Channels” bar, hit the left arrow to reveal the “See All” button, and select that.

That will take you to the screen where you can see all of your installed apps. If you installed Kodi correctly, it should be in there.