Overview
For those wondering how to change the game’s resolution, window type, and a few other basic settings.
Step 1
Right click the ‘Nioh’ game in your steam library and run the ‘Nioh Launcher Menu’, as shown in the following image.
Step 2
Select settings, as shown in the following image.
Step 3
You can change the resolution, window type, and a few other settings in the menu that appears. After choosing your desired settings, click ‘Ok’ to apply your settings. And now your game should run with the settings you specified. My settings for reference