I see many runners make their game window much smaller to help spot bastions or much easier find mapless buried treasure or do preemptive in the stronghold. How do you get your game that small quickly without even opening the menu? is it a mod or just a setting and how do I use it?

Using the program Julti, this video is more for the boat eye measurements but when he sets the hotkeys you can also set the thin resolution and the wide resolution.