SDL_SetWindowFullscreenMode - Set the display mode to use when a window is visible and fullscreen.

       This function is available since SDL 3.2.0.

       This only affects the display mode used when the window is fullscreen. To change the window size when the
       window is not fullscreen, use SDL_SetWindowSize().

       If  the  window  is  currently  in  the  fullscreen state, this request is asynchronous on some windowing
       systems and the new mode dimensions may not be applied immediately upon the return of this  function.  If
       an immediate change is required, call SDL_SyncWindow() to block until the changes have taken effect.

       When the new mode takes effect, an SDL_EVENT_WINDOW_RESIZED and/or an SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED
       event will be emitted with the new mode dimensions.

window the window to affect.

       mode   a pointer to the display mode to use, which can be NULL for borderless fullscreen desktop mode, or
              one  of  the  fullscreen  modes  returned  by  SDL_GetFullscreenDisplayModes() to set an exclusive
              fullscreen mode.

       SDL_SetWindowFullscreenMode - Set the display mode to use when a window is visible and fullscreen.

       for more information.

SDL_GetWindowFullscreenMode(3), SDL_SetWindowFullscreen(3), SDL_SyncWindow(3)

Simple Directmedia Layer                           SDL 3.2.20                     SDL_SetWindowFullscreenMode(3)

#include<SDL3/SDL_video.h>boolSDL_SetWindowFullscreenMode(SDL_Window*window,constSDL_DisplayMode*mode);

       This function should only be called on the main thread.