If DLSS is blurred out or not showing up, then there could be one of many issues. Make sure the Upscale Method is set to DLSS and that your graphics drivers are up to date. It's also worth checking if the game supports DLSS as there's currently only a small selection of titles that are compatible. If the game is a few years old, it's unlikely to support DLSS. Also make sure your graphics card supports DLSS. At this moment in time only the RTX 2000, RTX 3000 and RTX 4000 Nvidia graphics cards support DLSS.