Hi,
I use DF with my laptop and TV.
I'd like use The screen saver on the laptop when watching TV to avoid pixels killing on the laptop.
But I hav'nt found in the screen saver settings.
regards

Well what you should know is that screensavers were necessary when we had CRT monitors back 20-30 years ago but no longer necessary now we have LCD screens. Infact they are mostly used for decoration now-adays and classed as a energy waster.

It's true that with LED backlit displays screensavers today are mostly decoration. There is a bit of power saving using "blank" as a screensaver, but most power saving will come from when Windows turns off the display.

But LCD/LED displays illuminated with CCFL tubes will see power savings with a blank screensaver, and even more when the display turns off. Just as importantly, CCFL tubes do burn out, their color characteristics change as they age, and they get dimmer. Burn-in (image retention) can also happen and screensavers may help with this.

CRTs definitely did have a burn-in problem and screensavers helped.

If you have a relatively modern LED backlit display on your laptop, I wouldn't be too concerned about saving the pixels from getting "killed." The manufacturing technology has improved so much in the past 5-8 years that pixel problems are quite rare on at least mid-tier products. (All bets are off though if you're buying displays at flea markets or garage sales.)