SDL_HINT_VIDEO_X11_SCALING_FACTOR - Man Page

#include <SDL3/SDL_hints.h>

#define SDL_HINT_VIDEO_X11_SCALING_FACTOR "SDL_VIDEO_X11_SCALING_FACTOR"

The variable can be set to a floating point value in the range 1.0-10.0f

This hint should be set before SDL is initialized.

This hint is available since SDL 3.2.0.