Warning to direct users to appropriate function

src/platforms/rcore_desktop_glfw.c

@@ -307,6 +307,8 @@ void RestoreWindow(void)
 // Set window configuration state using flags
 void SetWindowState(unsigned int flags)
 {
+    if (!CORE.Window.ready) TRACELOG(LOG_WARNING, "WINDOW: SetWindowState does nothing before window initialization, Use \"SetConfigFlags\" instead");
+
     // Check previous state and requested state to apply required changes
     // NOTE: In most cases the functions already change the flags internally
 

src/platforms/rcore_desktop_rgfw.c

@@ -350,6 +350,8 @@ void RestoreWindow(void)
 // Set window configuration state using flags
 void SetWindowState(unsigned int flags)
 {
+    if (!CORE.Window.ready) TRACELOG(LOG_WARNING, "WINDOW: SetWindowState does nothing before window initialization, Use \"SetConfigFlags\" instead");
+
     CORE.Window.flags |= flags;
 
     if (flags & FLAG_VSYNC_HINT)

src/platforms/rcore_desktop_sdl.c

@@ -518,6 +518,8 @@ void RestoreWindow(void)
 // Set window configuration state using flags
 void SetWindowState(unsigned int flags)
 {
+    if (!CORE.Window.ready) TRACELOG(LOG_WARNING, "WINDOW: SetWindowState does nothing before window initialization, Use \"SetConfigFlags\" instead");
+
     CORE.Window.flags |= flags;
 
     if (flags & FLAG_VSYNC_HINT)

src/platforms/rcore_web.c

@@ -364,6 +364,8 @@ void RestoreWindow(void)
 // Set window configuration state using flags
 void SetWindowState(unsigned int flags)
 {
+    if (!CORE.Window.ready) TRACELOG(LOG_WARNING, "WINDOW: SetWindowState does nothing before window initialization, Use \"SetConfigFlags\" instead");
+
     // Check previous state and requested state to apply required changes
     // NOTE: In most cases the functions already change the flags internally
 

src/rcore.c

@@ -1905,6 +1905,8 @@ void TakeScreenshot(const char *fileName)
 // To configure window states after creation, just use SetWindowState()
 void SetConfigFlags(unsigned int flags)
 {
+    if (CORE.Window.ready) TRACELOG(LOG_WARNING, "WINDOW: SetConfigFlags called after window initialization, Use \"SetWindowState\" to set flags instead");
+
     // Selected flags are set but not evaluated at this point,
     // flag evaluation happens at InitWindow() or SetWindowState()
     CORE.Window.flags |= flags;