You can use either the Xfinity Stream app or the Manage Devices page within the Xfinity Stream portal to view devices that have downloaded content and remove downloads from any device authorized for use with Xfinity TV.

View devices with downloaded content and remove downloads from the following:

Steps for Managing Devices through the Xfinity Stream App

Open the Xfinity Stream app, and go to Settings.
Tap Manage Devices.
To return downloads from a device, under DEVICES WITH DOWNLOADS, tap Return on the device from which you wish to return watched content so it can be downloaded to another device.
A message will appear, asking: "Are you sure you want to return all downloads from this device?" Tap Yes, return to return all downloads.
Devices currently streaming will be listed. If you’ve reached your streaming limit, you’ll need to stop playback on one device before you can start playback on another.

Steps for Managing Devices Through the Xfinity Stream Portal

Visit xfinity.com/stream/settings/devices, enter your Xfinity ID or email address and password, and click the Sign In button.
Under Devices with Downloads, to remove a download from a device, select Return on the right-hand side of the device with the download.
Select Yes, return.
Removal will not be immediate, so please revisit or refresh the page after five minutes.
Devices currently streaming will be listed. If you’ve reached your streaming limit, you’ll need to stop playback on one device before you can start streaming on another.