Once you see it, it will be hard to not notice it. Look for small things moving around. Flying papers, debris, etc.
Dying Light 2, Hogwarts Legacy, MW2, Death Stranding are some examples that come to mind.
Some people are also more sensitive to it than others. Personally, I don’t notice it in most games with DLSS set to Quilty. Once I have to start dropping down to Balanced or Performance it becomes super obvious. There are exceptions, of course. I haven’t played the PC versions of DL2, MW2 or DS but Hogwarts shows issues even at Quality. At least, it did the last time I played haven’t looked at the PC version for a bit to see if anything improved.