Custom Window Titlebar with ImGui (Windows only) as WinAPI is used for that, should work with any render backend (only tested with Dx9) Should work with Windows Vista/7/8/10 (Windows 11 not tested)
(Could maybe work with Linux over Wine)
Preview:
https://github.com/nyaruku/ImGUI-Custom-Window-Titlebar/assets/38096703/a5f64616-3a75-4db2-ba1c-da125bbd0e9b