Samir The title bar should follow the current system theme, as it is managed by Windows. It's not the case actually ? Which version of Windows do you have ?
adem Samir i use windows 10 Edisyon Windows 10 Home Single Language Sürüm 22H2 İS derlemesi 19045.3930 Deneyim Windows Feature Experience Pack 1000.19053.1000.0 and i use dark mode