I have used the combo keys on my keyboard just fine and it works. If you click on Alt + Tab then you keep holding down Alt while you click on the app you need. You can also double click on home button and that also brings up recent apps and you can choose app from there or clear all apps. As for the screen saver you can open TV Settings not the regular Settings and you'll see options for screen saver. Location is:
TV Settings / Device Preferences / Screen Saver
then in there you can change the different screen saver options.
Thank you,
Alvatech
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