Way to go Roku - Eliminate Aquatic Life icon.

Compulynx 

Roku updated several screensavers/screensaver handling code today.

There are two versions of the "Aquatic Life" screensaver:  13.x and 3.x

13.x is only available for 4K/HDR models (and not available via Search), but once installed replicates to and is available on all models (including non-4K/HDR ones); no app icon.

3.0 is available via Search and installs and replicates on all supported models; app icon (prior to today).

In fact both will appear on all models as available in Settings/Theme/Screensavers once installed.

Assuming you have either version set as your Screensaver, simply set your screensaver start time to 1 minute, or preview them to get them to activate.

Prior to today, 3.x also (incorrectly) installed itself as an app.  Today's updates finally correct this mis-behavior, and 3.x only installs (correctly) as a screensaver.

The fact that the "app" for 3.x could be used to quickly load the screensaver was a side-benefit of the incorrectly installed screensaver, and one that shouldnt be relied upon to activate the screensaver (as you discovered since they fixed the install).

Roku isnt likely to roll back the updated screensaver support or updated screensavers, you'll just need to use the screensavers as intended: 

1) Wait for the configured start time:  Settings/Theme/Screensaver start time = 1/5/10/30

2) Activate on demand:  Settings/Theme/Screensavers/<screensaver name>/Preview screensaver