That screenshot looks like an Intel control panel. Make sure that you're using your Nvidia GPU for the game, not the Intel one. The Nvidia control panel has a place where you can tell it to use "High-performance Nvidia GPU" for ffxiv_dx11.exe. Do you actually have a 4k display or are you using some supersampling shenanigans? Playing at 4k does make the UI tiny if you don't adjust the UI scaling and text size as described by other people in previous posts.

As for the input lag, that could simply be due to low framerate. Try changing the game to the 1920x1080 resolution instead and see what happens. A 960M really isn't built for 4k gaming.