Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_WINDOWPOS_UNDEFINED - Used to indicate that you don't care what the window position/display is.
SYNOPSIS
#include <SDL3/SDL_video.h>
#define SDL_WINDOWPOS_UNDEFINED SDL_WINDOWPOS_UNDEFINED_DISPLAY(0)
DESCRIPTION
This always uses the primary display.
AVAILABILITY
This macro is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_WINDOWPOS_UNDEFINED(3)