Is the FSR of the LG client only valid for full-screen games?

Software & Operating Systems Looking Glass
1

I run TH01 in window mode, and the SFR of LG client does not seem to take effect.

2

LG’s FSR is applied to the entire desktop, not individual windows in the guest. Run your title in full screen but set the resolution lower then native so that FSR will operate. FSR is an upscaler and if there is nothing to upscale it is disabled.