Silent Hill 2 Hides FSR 3 and XeSS on Steam Deck Possibly Due to RAM Usage - Steam Deck HQ
steamdeckhq.com
It looks like Silent Hill 2 is hiding FSR 3 and XeSS on the Steam Deck, and it could be due to RAM usage.

You can re-enable these options by using the SteamDeck=0 %command% launch option, but this might cause the deck to crash if it runs out of RAM/VRAM.

This crash shouldn’t happen if you’re on SteamOS Beta (version 3.6 or newer) because it uses ZRAM, or if you’ve increased your swap file size. However memory having to be moved between ZRAM/swap and RAM/VRAM does cause reduced performance too, so more testing will be needed to see if it’s better to use FSR3/XeSS this way or not.