Where can I set DPI and HZ for Windows and an in-game setting for Fortnite?

Where can I set DPI and HZ for Windows and an in-game setting for Fortnite?

The DPI is a requirement for the printing industry with how many dots per inch (dots per inch, short dpi) a given image with a certain number of pixels (pixels) should be printed on a medium such as paper.

The DPI number of your monitor is a fixed value, which is given by the hardware of your monitor (how many screen points it has per inch), you can't "set".

And the Hertz number (refresh rate) depends on the monitor (what it can do) and the graphics card (what it can do), so you have to choose a setting in the Windows screen settings that is feasible for both devices (graphics card and monitor) .