This tool is great for people who play fullscreen games, but if you play windowed it currently won't work properly for you (even in windowed mode).

I got it to try and bump my 1440p@60fps to 1440p@120fps without making the GPU want to take off via the frame generation, and unfortunately while it does have a windowed mode that either draws over your window (it's wonky and slow) or a mode where it just does fullscreen but with black space to pad to your window size, which looks silly.

I like what it does but I have other stuff I want to see on my screen while playing so want to keep my games windowed.

I would also say if you are playing a game that supports dlss/FSR with frame generation, just use that instead as it will use frame buffer data to drive the upscaling/frame generation, which is pretty efficient and the data is already on the gpu. Lossless scaling is basically taking REALLY FAST screenshots of your game and upscaling/frame gen then drawing it over your screen quickly.