This pertains to any of the XR/XRS models with the Modern Home screen.

To uninstall an app it is basically the same as any Android
Settings>Apps>See All Apps
Once you find the app to uninstall on the shown list, open it and the Uninstall option will be there, along with some other functions and details.

There is another way as well and done directly from the Home screen.

With your Modern Home screen open, you should see an Add option. This allows you to add shortcuts to your Home screen.
Open the Add option/shortcut and add some other shortcuts from the list of apps that will be seen there.
With these new shortcuts seen on your Home screen, highlight one of them and then press and hold the OK button on the RCU

This will bring up a small context menu with three options.
1. Move - move the shortcut as seen on the Home screen.
2. Remove shortcut - remove from Home screen.
3. Uninstall - remove from Home screen and uninstall fully from BuzzTV box.