i crate a fully transparent NSWindow like this: NSWindowStyleMask styleMask = NSBorderlessWindowMask | NSFullSizeContentViewWindowMask; NSWinod *window = [[BrowserNSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 500, 600) styleMask:styleMask backing:NSBackingStoreBuffered defer:NO]; [window setBackgroundColor:[NSColor clearColor]]; [window setOpaque:NO]; [window setHasShadow:NO]; NSCustomView *view = [[NSCustomView alloc] initWithFrame:NSMakeRect(0, 0, 500, 600) andBrowserWindow:this]; [view setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)]; [view setAutoresizesSubviews: true]; [window.contentView addSubview:view]; and override the NSView drawRect function: - (void)drawRect:(NSRect)rect { [[NSColor clearColor] set]; NSRectFill(rect); NSRectFillUsingOperation(rect, NSCompositingOperationSourceOver); } i call setNeedDisplay:YES to redraw the view. in macos sonoma, i found that when after multiple calls setNeedDisplay:YES, the transparent window can't click through. This feature run correctly in previous versions, like macos 13，